diff --git a/1984/anonymous/.gitignore b/1984/anonymous/.gitignore
index 0e449506b..376ed9f37 100644
--- a/1984/anonymous/.gitignore
+++ b/1984/anonymous/.gitignore
@@ -1,2 +1,4 @@
 anonymous
 anonymous.alt
+anonymous.orig
+prog.orig
diff --git a/1984/anonymous/README.md b/1984/anonymous/README.md
index c9858cae2..1779cebbf 100644
--- a/1984/anonymous/README.md
+++ b/1984/anonymous/README.md
@@ -31,8 +31,9 @@ make alt
 
 #### To run:
 
+NOTE: this version might not work on some systems like macOS.
+
 ```sh
-echo NOTE: this version might not work on some systems.
 ./anonymous.alt
 ```
 
diff --git a/1984/anonymous/anonymous.c b/1984/anonymous/anonymous.c
index fcc248d83..5451c40af 100644
--- a/1984/anonymous/anonymous.c
+++ b/1984/anonymous/anonymous.c
@@ -1,2 +1,2 @@
-i;main(){for(;i["]<i;++i){--i;}"];read('-'-'-',i+++"hello, world!\\
+int i;main(){for(;i["]<i;++i){--i;}"];read('-'-'-',i+++"hello, world!\\
 n",'/'/'/'));}read(j,i,p)void*i;{write(j/p+p,i---j,(int)i/(int)i);}
diff --git a/1984/decot/.gitignore b/1984/decot/.gitignore
index 44d155e10..ad3856893 100644
--- a/1984/decot/.gitignore
+++ b/1984/decot/.gitignore
@@ -1 +1,3 @@
 decot
+decot.orig
+prog.orig
diff --git a/1984/decot/Makefile b/1984/decot/Makefile
index d6709ab28..3ff473135 100644
--- a/1984/decot/Makefile
+++ b/1984/decot/Makefile
@@ -40,7 +40,9 @@ include ../../var.mk
 #
 CSILENCE= -Wno-array-bounds -Wno-error -Wno-implicit-function-declaration \
 	-Wno-keyword-macro -Wno-main-return-type -Wno-missing-field-initializers \
-	-Wno-unused-value -Wno-unused-variable
+	-Wno-unused-value -Wno-unused-variable -Wno-deprecated-non-prototype \
+	-Wno-empty-body -Wno-int-conversion -Wno-int-to-pointer-cast -Wno-main \
+	-Wno-pointer-to-int-cast -Wno-return-type -Wno-unused-label
 
 # Common C compiler warning flags
 #
@@ -86,7 +88,9 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-format-nonliteral -Wno-missing-variable-declarations \
-	-Wno-pedantic -Wno-poison-system-directories -Wno-strict-prototypes
+	-Wno-pedantic -Wno-poison-system-directories -Wno-strict-prototypes \
+	-Wno-cast-function-type -Wno-float-conversion -Wno-padded \
+	-Wno-unreachable-code
 #
 CWARN+= -Weverything
 #
diff --git a/1984/decot/README.md b/1984/decot/README.md
index e8a963b9e..383f55de2 100644
--- a/1984/decot/README.md
+++ b/1984/decot/README.md
@@ -16,13 +16,7 @@ make all
 
 ### Alternate code:
 
-The alternate code, [decot.alt.c](decot.alt.c), is the original code that
-requires `-traditional-cpp` and will also run afoul with clang's requirement for
-the second and third arguments to main() being a `char **` (the fixed version's
-main() only has one arg, an int). It is a minor fix to Yusuke's fix. Thank you
-Yusuke and Cody!
-
-To try this version:
+To try the original code that requires `-traditional-cpp`:
 
 ```sh
 make alt
diff --git a/1984/laman/.gitignore b/1984/laman/.gitignore
index 0723ff8d6..9f0d9e790 100644
--- a/1984/laman/.gitignore
+++ b/1984/laman/.gitignore
@@ -1 +1,3 @@
 laman
+laman.orig
+prog.orig
diff --git a/1984/laman/Makefile b/1984/laman/Makefile
index 72c808fcf..e79262586 100644
--- a/1984/laman/Makefile
+++ b/1984/laman/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1984/mullender/.gitignore b/1984/mullender/.gitignore
index 14a439de4..9be0bd5b7 100644
--- a/1984/mullender/.gitignore
+++ b/1984/mullender/.gitignore
@@ -1,3 +1,5 @@
 mullender
 mullender.alt
 gentab
+mullender.orig
+prog.orig
diff --git a/1984/mullender/Makefile b/1984/mullender/Makefile
index f1fab7dff..2447a5fdc 100644
--- a/1984/mullender/Makefile
+++ b/1984/mullender/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-main
+CSILENCE= -Wno-main -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -83,7 +83,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories
+CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories \
+	-Wno-pedantic -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1985/applin/.gitignore b/1985/applin/.gitignore
index 65b2a0f49..65af7d048 100644
--- a/1985/applin/.gitignore
+++ b/1985/applin/.gitignore
@@ -1 +1,3 @@
 applin
+applin.orig
+prog.orig
diff --git a/1985/applin/Makefile b/1985/applin/Makefile
index d0f1abe41..6d7787a68 100644
--- a/1985/applin/Makefile
+++ b/1985/applin/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-logical-op-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-logical-op-parentheses \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1985/august/.gitignore b/1985/august/.gitignore
index 36c24223d..94bab546a 100644
--- a/1985/august/.gitignore
+++ b/1985/august/.gitignore
@@ -1 +1,3 @@
 august
+august.orig
+prog.orig
diff --git a/1985/august/Makefile b/1985/august/Makefile
index e76bcd227..4c04ff980 100644
--- a/1985/august/Makefile
+++ b/1985/august/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-main \
-	-Wno-unused-parameter -Wno-unused-variable
+	-Wno-unused-parameter -Wno-unused-variable -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1985/lycklama/.gitignore b/1985/lycklama/.gitignore
index 57b8242ed..6392e57c3 100644
--- a/1985/lycklama/.gitignore
+++ b/1985/lycklama/.gitignore
@@ -1 +1,4 @@
 lycklama
+lycklama.alt
+lycklama.orig
+prog.orig
diff --git a/1985/lycklama/Makefile b/1985/lycklama/Makefile
index de594d275..7a0d44dc3 100644
--- a/1985/lycklama/Makefile
+++ b/1985/lycklama/Makefile
@@ -58,7 +58,7 @@ ARCH=
 
 # Defines that are needed to compile
 #
-CDEFINE= -DZ=0
+CDEFINE= -DZ=500
 
 # Include files that are needed to compile
 #
@@ -85,7 +85,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-implicit-int-conversion -Wno-poison-system-directories \
-	-Wno-unused-macros
+	-Wno-unused-macros -Wno-strict-prototypes
 #
 CWARN+= -Weverything
 #
diff --git a/1985/lycklama/README.md b/1985/lycklama/README.md
index 6a1f47686..42ccb7f61 100644
--- a/1985/lycklama/README.md
+++ b/1985/lycklama/README.md
@@ -8,19 +8,14 @@ Ed Lycklama
 make all
 ```
 
-
-With a tip from [Yusuke Endoh](/winners.html#Yusuke_Endoh)  it was indirectly
-noticed that if one slows down the call to `write()` one can see some fun output
-that's not visible with modern systems so Cody added a call to `usleep()`. The
-default time is `0` which disables it (in order to make it as close to original
-as possible; an alt version already exists mostly for fun output). In order to
-change the speed (try 500 or 700) do:
+If you have an old enough compiler you can try:
 
 ```sh
-make CDEFINE+="-DZ=700" clobber all
+make lycklama.orig
 ```
 
-Thank you Yusuke!
+
+
 
 ## To run:
 
@@ -28,6 +23,10 @@ Thank you Yusuke!
 ./lycklama < some_file
 ```
 
+There is an alternate version which slows down the output for a more fun display
+with modern systems. For this reason we encourage you to try that version
+as well. See Alternate code section below. 
+
 ## Try:
 
 ```sh
@@ -40,20 +39,29 @@ Thank you Yusuke!
 
 ./lycklama < Makefile
 
-make CDEFINE+="-DZ=700" clobber all && ./lycklama < lycklama.c
 ```
 
+
 ### Alternative code:
 
-If you have an older compiler that lets you define some object to `#define` and
-then use it in place of `#define` you can run:
+This alternate version slows down the output which will provide more fun
+output. The default time passed to `usleep(3)` is `500` but you can reconfigure
+it like:
+
 
 ```sh
-make alt
+make CDEFINE+="-DZ=700" clobber alt
 ```
 
-Use `./lylycklama.alt` as you would `./lycklama` above.
+Use `./lycklama.alt` as you would `./lycklama` above.
 
+#### Try:
+
+```sh
+./lycklama.alt < lycklama.alt.c
+./lycklama.alt < lycklama.orig.c
+./lycklama.alt < Makefile
+```
 
 ## Judges' remarks:
 
diff --git a/1985/lycklama/lycklama.alt.c b/1985/lycklama/lycklama.alt.c
index d7a3776fd..72a594f36 100644
--- a/1985/lycklama/lycklama.alt.c
+++ b/1985/lycklama/lycklama.alt.c
@@ -1,16 +1,16 @@
 #define o define
-#o ___o write
-#o ooo (unsigned)
-#o o_o_ 1
-#o _o_ char
-#o _oo goto
-#o _oo_ read
-#o o_o for
-#o o_ main
-#o o__ if
-#o oo_ 0
-#o _o(_,__,___)(void)___o(_,__,ooo(___))
-#o __o (o_o_<<((o_o_<<(o_o_<<o_o_))+(o_o_<<o_o_)))+(o_o_<<(o_o_<<(o_o_<<o_o_)))
+#define ___o write
+#define ooo (unsigned)
+#define o_o_ 1
+#define _o_ char
+#define _oo goto
+#define _oo_ read
+#define o_o for
+#define o_ main
+#define o__ if
+#define oo_ 0
+#define _o(_,__,___)(void)___o(_,__,ooo(___),Z&&usleep(Z))
+#define __o (o_o_<<((o_o_<<(o_o_<<o_o_))+(o_o_<<o_o_)))+(o_o_<<(o_o_<<(o_o_<<o_o_)))
 o_(){_o_ _=oo_,__,___,____[__o];_oo ______;_____:___=__o-o_o_; _______:
 _o(o_o_,____,__=(_-o_o_<___?_-o_o_:___));o_o(;__;_o(o_o_,"\b",o_o_),__--);
 _o(o_o_," ",o_o_);o__(--___)_oo _______;_o(o_o_,"\n",o_o_);______:o__(_=_oo_(
diff --git a/1985/lycklama/lycklama.c b/1985/lycklama/lycklama.c
index 72a594f36..3bb0f7462 100644
--- a/1985/lycklama/lycklama.c
+++ b/1985/lycklama/lycklama.c
@@ -9,7 +9,7 @@
 #define o_ main
 #define o__ if
 #define oo_ 0
-#define _o(_,__,___)(void)___o(_,__,ooo(___),Z&&usleep(Z))
+#define _o(_,__,___)(void)___o(_,__,ooo(___))
 #define __o (o_o_<<((o_o_<<(o_o_<<o_o_))+(o_o_<<o_o_)))+(o_o_<<(o_o_<<(o_o_<<o_o_)))
 o_(){_o_ _=oo_,__,___,____[__o];_oo ______;_____:___=__o-o_o_; _______:
 _o(o_o_,____,__=(_-o_o_<___?_-o_o_:___));o_o(;__;_o(o_o_,"\b",o_o_),__--);
diff --git a/1985/shapiro/.gitignore b/1985/shapiro/.gitignore
index 9912ed2e4..edddfcd1d 100644
--- a/1985/shapiro/.gitignore
+++ b/1985/shapiro/.gitignore
@@ -1 +1,3 @@
 shapiro
+shapiro.orig
+prog.orig
diff --git a/1985/shapiro/Makefile b/1985/shapiro/Makefile
index db2172a0b..37e8b297e 100644
--- a/1985/shapiro/Makefile
+++ b/1985/shapiro/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-parentheses -Wno-string-plus-int
+	-Wno-parentheses -Wno-string-plus-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1985/sicherman/.gitignore b/1985/sicherman/.gitignore
index 7cf6dfe81..595c6629c 100644
--- a/1985/sicherman/.gitignore
+++ b/1985/sicherman/.gitignore
@@ -1,2 +1,4 @@
 sicherman
 sicherman.alt
+sicherman.orig
+prog.orig
diff --git a/1985/sicherman/Makefile b/1985/sicherman/Makefile
index 3ff5c547d..b7495948d 100644
--- a/1985/sicherman/Makefile
+++ b/1985/sicherman/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-comment
+CSILENCE= -Wno-comment -Wno-deprecated-non-prototype -Wno-main -Wno-pedantic \
+	-Wno-return-type -Wno-strict-prototypes -Wno-unused-parameter
 
 # Common C compiler warning flags
 #
@@ -83,7 +84,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories
+CSILENCE+= -Wno-poison-system-directories -Wno-comma -Wno-missing-prototypes \
+	-Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/1986/applin/.gitignore b/1986/applin/.gitignore
index 65b2a0f49..65af7d048 100644
--- a/1986/applin/.gitignore
+++ b/1986/applin/.gitignore
@@ -1 +1,3 @@
 applin
+applin.orig
+prog.orig
diff --git a/1986/applin/Makefile b/1986/applin/Makefile
index 60b105f59..4ae974b67 100644
--- a/1986/applin/Makefile
+++ b/1986/applin/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-error \
-	-Wno-implicit-function-declaration -Wno-implicit-int
+	-Wno-implicit-function-declaration -Wno-implicit-int \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1986/august/.gitignore b/1986/august/.gitignore
index 36c24223d..94bab546a 100644
--- a/1986/august/.gitignore
+++ b/1986/august/.gitignore
@@ -1 +1,3 @@
 august
+august.orig
+prog.orig
diff --git a/1986/august/Makefile b/1986/august/Makefile
index 6e892c6ae..6e5924207 100644
--- a/1986/august/Makefile
+++ b/1986/august/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int -Wno-return-type
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
+	-Wno-return-type -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1986/bright/.gitignore b/1986/bright/.gitignore
index 52d62d264..ceefa06fb 100644
--- a/1986/bright/.gitignore
+++ b/1986/bright/.gitignore
@@ -1 +1,3 @@
 bright
+bright.orig
+prog.orig
diff --git a/1986/bright/Makefile b/1986/bright/Makefile
index ae8b32fdf..2ad0ca59a 100644
--- a/1986/bright/Makefile
+++ b/1986/bright/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format-security \
 	-Wno-implicit-int -Wno-unknown-escape-sequence -Wno-unused-value \
-	-Wno-sign-compare
+	-Wno-sign-compare -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1986/hague/.gitignore b/1986/hague/.gitignore
index 6d1bd4618..3bbef39c6 100644
--- a/1986/hague/.gitignore
+++ b/1986/hague/.gitignore
@@ -1 +1,3 @@
 hague
+hague.orig
+prog.orig
diff --git a/1986/hague/Makefile b/1986/hague/Makefile
index 3698b59ff..90522960c 100644
--- a/1986/hague/Makefile
+++ b/1986/hague/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-incompatible-library-redeclaration -Wno-return-type
+	-Wno-incompatible-library-redeclaration -Wno-return-type \
+	-Wno-deprecated-declarations -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1986/holloway/.gitignore b/1986/holloway/.gitignore
index 47d139d24..497646c62 100644
--- a/1986/holloway/.gitignore
+++ b/1986/holloway/.gitignore
@@ -1 +1,3 @@
 holloway
+holloway.orig
+prog.orig
diff --git a/1986/holloway/Makefile b/1986/holloway/Makefile
index 9821a8ee1..80c795f5d 100644
--- a/1986/holloway/Makefile
+++ b/1986/holloway/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-format-security -Wno-implicit-int -Wno-int-to-pointer-cast \
-	-Wno-pointer-to-int-cast
+	-Wno-pointer-to-int-cast -Wno-deprecated-non-prototype \
+	-Wno-incompatible-pointer-types
 
 # Common C compiler warning flags
 #
@@ -85,7 +86,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-missing-variable-declarations -Wno-pedantic \
-	-Wno-poison-system-directories -Wno-shadow
+	-Wno-poison-system-directories -Wno-shadow -Wno-implicit-int-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1986/marshall/.gitignore b/1986/marshall/.gitignore
index 461019cfd..e210bbde3 100644
--- a/1986/marshall/.gitignore
+++ b/1986/marshall/.gitignore
@@ -1 +1,3 @@
 marshall
+marshall.orig
+prog.orig
diff --git a/1986/marshall/Makefile b/1986/marshall/Makefile
index d9068b441..3291ed941 100644
--- a/1986/marshall/Makefile
+++ b/1986/marshall/Makefile
@@ -40,7 +40,9 @@ include ../../var.mk
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
 	-Wno-int-conversion -Wno-parentheses -Wno-shift-negative-value \
-	-Wno-string-compare -Wno-unsequenced -Wno-unused-value
+	-Wno-string-compare -Wno-unsequenced -Wno-unused-value \
+	-Wno-deprecated-non-prototype -Wno-pointer-to-int-cast -Wno-return-type \
+        -Wno-strict-prototypes -Wno-uninitialized -Wno-unused-parameter
 
 # Common C compiler warning flags
 #
@@ -86,7 +88,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-missing-prototypes -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-strict-prototypes -Wno-unreachable-code
 #
 CWARN+= -Weverything
 #
diff --git a/1986/pawka/.gitignore b/1986/pawka/.gitignore
index 01f5f0500..c01f77fa3 100644
--- a/1986/pawka/.gitignore
+++ b/1986/pawka/.gitignore
@@ -1 +1,3 @@
 pawka
+pawka.orig
+prog.orig
diff --git a/1986/pawka/Makefile b/1986/pawka/Makefile
index 058d6c30b..61ec69fb0 100644
--- a/1986/pawka/Makefile
+++ b/1986/pawka/Makefile
@@ -57,7 +57,7 @@ ARCH=
 
 # Defines that are needed to compile
 #
-CDEFINE=
+CDEFINE= -Wno-strict-prototypes
 
 # Include files that are needed to compile
 #
diff --git a/1986/stein/.gitignore b/1986/stein/.gitignore
index 941454984..918d8ef98 100644
--- a/1986/stein/.gitignore
+++ b/1986/stein/.gitignore
@@ -1,2 +1,4 @@
 a.out
 stein
+stein.orig
+prog.orig
diff --git a/1986/stein/Makefile b/1986/stein/Makefile
index 4556f0955..fc0681611 100644
--- a/1986/stein/Makefile
+++ b/1986/stein/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int -Wno-int-conversion
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
+	-Wno-int-conversion -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1986/wall/.gitignore b/1986/wall/.gitignore
index 8784710db..efdb54e71 100644
--- a/1986/wall/.gitignore
+++ b/1986/wall/.gitignore
@@ -1,2 +1,4 @@
 wall
 wall.alt
+wall.orig
+prog.orig
diff --git a/1986/wall/Makefile b/1986/wall/Makefile
index fdf429fbc..fd6aafdde 100644
--- a/1986/wall/Makefile
+++ b/1986/wall/Makefile
@@ -39,7 +39,9 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-macro-redefined -Wno-parentheses -Wno-c99-extensions
+	-Wno-macro-redefined -Wno-parentheses -Wno-c99-extensions \
+	-Wno-declaration-after-statement -Wno-deprecated-non-prototype \
+        -Wno-strict-prototypes -Wno-string-plus-char
 
 # Common C compiler warning flags
 #
@@ -86,7 +88,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-implicit-int-conversion -Wno-missing-prototypess \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-strict-prototypes
+	-Wno-strict-prototypes -Wno-missing-prototypes -Wno-unknown-warning-option \
+	-Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/1987/biggar/.gitignore b/1987/biggar/.gitignore
index a3fda3cc8..a16c4d2dd 100644
--- a/1987/biggar/.gitignore
+++ b/1987/biggar/.gitignore
@@ -1 +1,3 @@
 biggar
+biggar.orig
+prog.orig
diff --git a/1987/biggar/Makefile b/1987/biggar/Makefile
index 79ba112fa..b8411984d 100644
--- a/1987/biggar/Makefile
+++ b/1987/biggar/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-extra-semi
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-extra-semi \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1987/heckbert/.gitignore b/1987/heckbert/.gitignore
index cb092098f..f0079d9a3 100644
--- a/1987/heckbert/.gitignore
+++ b/1987/heckbert/.gitignore
@@ -5,3 +5,5 @@ foo.c
 heckbert
 ph
 ph.c
+heckbert.orig
+prog.orig
diff --git a/1987/heckbert/Makefile b/1987/heckbert/Makefile
index b8bb82836..2848b8962 100644
--- a/1987/heckbert/Makefile
+++ b/1987/heckbert/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-int-to-pointer-cast -Wno-logical-op-parentheses
+	-Wno-int-to-pointer-cast -Wno-logical-op-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1987/hines/.gitignore b/1987/hines/.gitignore
index 6c51004a0..6f60fc57c 100644
--- a/1987/hines/.gitignore
+++ b/1987/hines/.gitignore
@@ -1,2 +1,4 @@
 hines
 hines.alt
+hines.orig
+prog.orig
diff --git a/1987/hines/Makefile b/1987/hines/Makefile
index bea8135e1..3a1b3ad54 100644
--- a/1987/hines/Makefile
+++ b/1987/hines/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1987/korn/.gitignore b/1987/korn/.gitignore
index e537c34cc..490a6878b 100644
--- a/1987/korn/.gitignore
+++ b/1987/korn/.gitignore
@@ -1 +1,3 @@
 korn
+korn.orig
+prog.orig
diff --git a/1987/korn/Makefile b/1987/korn/Makefile
index 2447181b0..a1c1c67ff 100644
--- a/1987/korn/Makefile
+++ b/1987/korn/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int -Dunix=1 \
-	-Wno-string-plus-int
+	-Wno-string-plus-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1987/lievaart/.gitignore b/1987/lievaart/.gitignore
index 37904d3f8..4c859f6cb 100644
--- a/1987/lievaart/.gitignore
+++ b/1987/lievaart/.gitignore
@@ -2,3 +2,5 @@ lievaart
 lievaart.alt
 lievaart2
 lievaart2.alt
+lievaart.orig
+prog.orig
diff --git a/1987/lievaart/Makefile b/1987/lievaart/Makefile
index 7ec980818..a36742279 100644
--- a/1987/lievaart/Makefile
+++ b/1987/lievaart/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1987/wall/.gitignore b/1987/wall/.gitignore
index 8784710db..efdb54e71 100644
--- a/1987/wall/.gitignore
+++ b/1987/wall/.gitignore
@@ -1,2 +1,4 @@
 wall
 wall.alt
+wall.orig
+prog.orig
diff --git a/1987/wall/Makefile b/1987/wall/Makefile
index 3edd2f5eb..90bedad40 100644
--- a/1987/wall/Makefile
+++ b/1987/wall/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
 	-Wno-incompatible-library-redeclaration -Wno-return-type -Wno-string-plus-int \
-	-Wno-unknown-escape-sequence -Wno-deprecated-declarations
+	-Wno-unknown-escape-sequence -Wno-deprecated-declarations \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1987/westley/.gitignore b/1987/westley/.gitignore
index 2a0c890f9..745e11d2f 100644
--- a/1987/westley/.gitignore
+++ b/1987/westley/.gitignore
@@ -1 +1,3 @@
 westley
+westley.orig
+prog.orig
diff --git a/1987/westley/Makefile b/1987/westley/Makefile
index aa230ec97..773cc2aa9 100644
--- a/1987/westley/Makefile
+++ b/1987/westley/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-for-loop-analysis -Wno-unused-value
+CSILENCE= -Wno-for-loop-analysis -Wno-unused-value \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -84,7 +85,8 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-strict-prototypes \
+	-Wno-conditional-uninitialized
 #
 CWARN+= -Weverything
 #
diff --git a/1988/applin/.gitignore b/1988/applin/.gitignore
index 04167c655..f2a57c672 100644
--- a/1988/applin/.gitignore
+++ b/1988/applin/.gitignore
@@ -3,3 +3,5 @@ large.c
 zsmall
 zsmall.c
 applin.alt
+applin.orig
+prog.orig
diff --git a/1988/applin/Makefile b/1988/applin/Makefile
index f34bf5d81..f8af0bbf1 100644
--- a/1988/applin/Makefile
+++ b/1988/applin/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-expansion-to-defined -Wno-implicit-int
+CSILENCE= -Wno-expansion-to-defined -Wno-implicit-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1988/dale/.gitignore b/1988/dale/.gitignore
index 9d911c5df..1e84d450e 100644
--- a/1988/dale/.gitignore
+++ b/1988/dale/.gitignore
@@ -1,2 +1,4 @@
 dale
 dale.alt
+dale.orig
+prog.orig
diff --git a/1988/dale/Makefile b/1988/dale/Makefile
index 4120e7862..37840880e 100644
--- a/1988/dale/Makefile
+++ b/1988/dale/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-implicit-function-declaration -Wno-implicit-int -Wno-keyword-macro \
-	-Wno-pointer-to-int-cast -Wno-return-type -Wno-unused-value
+	-Wno-pointer-to-int-cast -Wno-return-type -Wno-unused-value \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -84,7 +85,9 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories
+CSILENCE+= -Wno-poison-system-directories -Wno-comma -Wno-missing-prototypes \
+	-Wno-missing-variable-declarations -Wno-pedantic -Wno-shorten-64-to-32 \
+	-Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/1988/isaak/.gitignore b/1988/isaak/.gitignore
index a9d43db81..6cc5143d4 100644
--- a/1988/isaak/.gitignore
+++ b/1988/isaak/.gitignore
@@ -1,3 +1,5 @@
 isaak
 isaak.alt
 isaak.output
+isaak.orig
+prog.orig
diff --git a/1988/isaak/Makefile b/1988/isaak/Makefile
index 080ec92e3..efcf8d3f7 100644
--- a/1988/isaak/Makefile
+++ b/1988/isaak/Makefile
@@ -42,7 +42,7 @@ CSILENCE=  -Wno-comma -Wno-implicit-function-declaration -Wno-format-insufficien
 	-Wno-implicit-int -Wno-incompatible-library-redeclaration -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories -Wno-return-type \
 	-Wno-shadow -Wno-shift-op-parentheses -Wno-strict-prototypes -Wno-unreachable-code \
-	-Wno-unused-macros
+	-Wno-unused-macros -Wno-int-conversion -Wno-macro-redefined
 
 # Common C compiler warning flags
 #
diff --git a/1988/litmaath/.gitignore b/1988/litmaath/.gitignore
index ef2cc4b0f..147973fd9 100644
--- a/1988/litmaath/.gitignore
+++ b/1988/litmaath/.gitignore
@@ -1,2 +1,4 @@
 litmaath
 litmaath.alt
+litmaath.orig
+prog.orig
diff --git a/1988/litmaath/Makefile b/1988/litmaath/Makefile
index 370e7cbc0..ad37da5af 100644
--- a/1988/litmaath/Makefile
+++ b/1988/litmaath/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-logical-op-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-logical-op-parentheses \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1988/phillipps/.gitignore b/1988/phillipps/.gitignore
index d9a2e652b..4aabe24bb 100644
--- a/1988/phillipps/.gitignore
+++ b/1988/phillipps/.gitignore
@@ -1 +1,3 @@
 phillipps
+phillipps.orig
+prog.orig
diff --git a/1988/phillipps/Makefile b/1988/phillipps/Makefile
index e6ff95cac..b16bdebdb 100644
--- a/1988/phillipps/Makefile
+++ b/1988/phillipps/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-pedantic -Wno-logical-not-parentheses -Wno-implicit-function-declaration \
 	-Wno-incompatible-pointer-types -Wno-int-conversion -Wno-pointer-to-int-cast \
-	-Wno-pointer-integer-compare -Wno-compare-distinct-pointer-types
+	-Wno-pointer-integer-compare -Wno-compare-distinct-pointer-types \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -85,7 +86,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories -Wno-comma
+CSILENCE+= -Wno-poison-system-directories -Wno-comma \
+	-Wno-missing-prototypes
 #
 CWARN+= -Weverything
 #
diff --git a/1988/reddy/.gitignore b/1988/reddy/.gitignore
index a7e8e8ce4..a2bce76c3 100644
--- a/1988/reddy/.gitignore
+++ b/1988/reddy/.gitignore
@@ -1 +1,3 @@
 reddy
+reddy.orig
+prog.orig
diff --git a/1988/reddy/Makefile b/1988/reddy/Makefile
index 462e0415e..f5c060f93 100644
--- a/1988/reddy/Makefile
+++ b/1988/reddy/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-pedantic -Wno-error -Wno-implicit-function-declaration -Wno-parentheses \
-	-Wno-return-type -Wno-deprecated-declarations
+	-Wno-return-type -Wno-deprecated-declarations -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1988/robison/.gitignore b/1988/robison/.gitignore
index c124d1dbc..672ba4f0c 100644
--- a/1988/robison/.gitignore
+++ b/1988/robison/.gitignore
@@ -1 +1,3 @@
 robison
+robison.orig
+prog.orig
diff --git a/1988/robison/Makefile b/1988/robison/Makefile
index da894b713..db224e0f8 100644
--- a/1988/robison/Makefile
+++ b/1988/robison/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1988/spinellis/.gitignore b/1988/spinellis/.gitignore
index 691594a06..27171b2cf 100644
--- a/1988/spinellis/.gitignore
+++ b/1988/spinellis/.gitignore
@@ -1,3 +1,5 @@
 prog.c
 spinellis
 spinellis.alt
+spinellis.orig
+prog.orig
diff --git a/1988/westley/.gitignore b/1988/westley/.gitignore
index 0c08f64e6..9b69ec7c5 100644
--- a/1988/westley/.gitignore
+++ b/1988/westley/.gitignore
@@ -1,2 +1,4 @@
 westley
 westley.alt
+westley.orig
+prog.orig
diff --git a/1988/westley/Makefile b/1988/westley/Makefile
index c4a7ed1ad..dd8aebef9 100644
--- a/1988/westley/Makefile
+++ b/1988/westley/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-return-type
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-return-type \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1989/fubar/.gitignore b/1989/fubar/.gitignore
index e9d51691f..7d78090b1 100644
--- a/1989/fubar/.gitignore
+++ b/1989/fubar/.gitignore
@@ -3,3 +3,5 @@ ouroboros
 ouroboros.c
 x
 x1
+fubar.orig
+prog.orig
diff --git a/1989/jar.1/.gitignore b/1989/jar.1/.gitignore
index c4791d11a..a081e5850 100644
--- a/1989/jar.1/.gitignore
+++ b/1989/jar.1/.gitignore
@@ -1 +1,3 @@
 jar.1
+jar.1.orig
+prog.orig
diff --git a/1989/jar.2/.gitignore b/1989/jar.2/.gitignore
index f445be170..4ea9ded3b 100644
--- a/1989/jar.2/.gitignore
+++ b/1989/jar.2/.gitignore
@@ -1 +1,3 @@
 jar.2
+jar.2.orig
+prog.orig
diff --git a/1989/jar.2/Makefile b/1989/jar.2/Makefile
index 3a00f9506..72251fa5a 100644
--- a/1989/jar.2/Makefile
+++ b/1989/jar.2/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-implicit-function-declaration -Wno-missing-braces -Wno-parentheses
+CSILENCE= -Wno-implicit-function-declaration -Wno-missing-braces -Wno-parentheses \
+	-Wno-deprecated-non-prototype -Wno-pedantic -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -83,7 +84,9 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-cast-align -Wno-comma -Wno-float-equal -Wno-implicit-int-conversion \
+	-Wno-missing-prototypes -Wno-missing-variable-declarations \
+	-Wno-poison-system-directories -Wno-shorten-64-to-32
 #
 CWARN+= -Weverything
 #
diff --git a/1989/ovdluhe/.gitignore b/1989/ovdluhe/.gitignore
index e3366e267..21b883e19 100644
--- a/1989/ovdluhe/.gitignore
+++ b/1989/ovdluhe/.gitignore
@@ -1,2 +1,4 @@
 ovdluhe
 ovdluhe.alt
+ovdluhe.orig
+prog.orig
diff --git a/1989/ovdluhe/Makefile b/1989/ovdluhe/Makefile
index 940fe1c0f..e34e32258 100644
--- a/1989/ovdluhe/Makefile
+++ b/1989/ovdluhe/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-char-subscripts -Wno-constant-conversion -Wno-empty-body \
 	-Wno-implicit-function-declaration -Wno-parentheses -Wno-unsequenced \
-	-Wno-unused-variable
+	-Wno-unused-variable -Wno-strict-prototypes \
+	-Wno-extra-semi -Wno-non-literal-null-conversion
 
 # Common C compiler warning flags
 #
diff --git a/1989/paul/.gitignore b/1989/paul/.gitignore
index ea015f609..d4c8f86ea 100644
--- a/1989/paul/.gitignore
+++ b/1989/paul/.gitignore
@@ -1 +1,3 @@
 paul
+paul.orig
+prog.orig
diff --git a/1989/paul/Makefile b/1989/paul/Makefile
index 30d0df6d3..c0c3e1ba0 100644
--- a/1989/paul/Makefile
+++ b/1989/paul/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format-security \
 	-Wno-incompatible-library-redeclaration -Wno-int-to-pointer-cast \
-	-Wno-pointer-to-int-cast -Wno-return-type
+	-Wno-pointer-to-int-cast -Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1989/robison/.gitignore b/1989/robison/.gitignore
index c124d1dbc..672ba4f0c 100644
--- a/1989/robison/.gitignore
+++ b/1989/robison/.gitignore
@@ -1 +1,3 @@
 robison
+robison.orig
+prog.orig
diff --git a/1989/robison/Makefile b/1989/robison/Makefile
index a170d2142..d4ce927b6 100644
--- a/1989/robison/Makefile
+++ b/1989/robison/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-unused-parameter
+CSILENCE= -Wno-unused-parameter -Wno-deprecated-non-prototype -Wno-format-extra-args \
+        -Wno-int-to-pointer-cast -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -88,7 +89,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-missing-prototypes -Wno-poison-system-directories \
-	-Wno-strict-prototypes
+	-Wno-strict-prototypes -Wno-bad-function-cast -Wno-missing-variable-declarations
 #
 CWARN+= -Weverything
 #
diff --git a/1989/roemer/.gitignore b/1989/roemer/.gitignore
index f50dd86a6..35799487b 100644
--- a/1989/roemer/.gitignore
+++ b/1989/roemer/.gitignore
@@ -1 +1,3 @@
 roemer
+roemer.orig
+prog.orig
diff --git a/1989/roemer/Makefile b/1989/roemer/Makefile
index 9cce53cb1..3a83e5a5e 100644
--- a/1989/roemer/Makefile
+++ b/1989/roemer/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
-	-Wno-string-plus-int -Wno-unused-value
+	-Wno-string-plus-int -Wno-unused-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1989/tromp/.gitignore b/1989/tromp/.gitignore
index 31d4f7e59..7aedf5800 100644
--- a/1989/tromp/.gitignore
+++ b/1989/tromp/.gitignore
@@ -1,3 +1,5 @@
 tromp
 tromp.alt
 HI
+tromp.orig
+prog.orig
diff --git a/1989/tromp/Makefile b/1989/tromp/Makefile
index 85ca5eaa5..6ae11c361 100644
--- a/1989/tromp/Makefile
+++ b/1989/tromp/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-error -Wno-pointer-to-int-cast -Wno-no-return-type -Wno-empty-body \
 	  -Wno-implicit-function-declaration -Wno-string-plus-int -Wno-return-type \
-	  -Wno-unknown-warning-option
+	  -Wno-unknown-warning-option -Wno-deprecated-non-prototype \
+	  -Wno-shorten-64-to-32 -Wno-int-conversion
 
 # Common C compiler warning flags
 #
@@ -87,7 +88,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-format-nonliteral -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-pedantic \
-	-Wno-poison-system-directories -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-strict-prototypes \
+	-Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1989/vanb/.gitignore b/1989/vanb/.gitignore
index c0fa8eb22..43ddaba26 100644
--- a/1989/vanb/.gitignore
+++ b/1989/vanb/.gitignore
@@ -1 +1,3 @@
 vanb
+vanb.orig
+prog.orig
diff --git a/1989/vanb/Makefile b/1989/vanb/Makefile
index 8b13c7d77..0319a77e6 100644
--- a/1989/vanb/Makefile
+++ b/1989/vanb/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration -Wno-pedantic
+CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration -Wno-pedantic \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1989/westley/.gitignore b/1989/westley/.gitignore
index ad524dd54..25ce9886f 100644
--- a/1989/westley/.gitignore
+++ b/1989/westley/.gitignore
@@ -7,3 +7,5 @@ ver2.c
 ver3
 ver3.c
 westley
+westley.orig
+prog.orig
diff --git a/1989/westley/Makefile b/1989/westley/Makefile
index 9b97834c2..eef3a947a 100644
--- a/1989/westley/Makefile
+++ b/1989/westley/Makefile
@@ -39,7 +39,9 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-comment -Wno-error -Wno-implicit-function-declaration \
-	-Wno-logical-op-parentheses
+	-Wno-logical-op-parentheses -Wno-deprecated-non-prototype \
+	-Wno-int-conversion -Wno-return-type \
+	-Wno-comma -Wno-missing-variable-declarations -Wno-unused-value
 
 # Common C compiler warning flags
 #
@@ -138,21 +140,21 @@ alt: data ${ALT_TARGET}
 	@${TRUE}
 
 ver0: ${PROG}
-	./${PROG} < westley.c > ver0.c
+	-./${PROG} < westley.c > ver0.c
 	-${CC} ${CFLAGS} ver0.c -o $@ ${LIBS}
 
 ver1: ${PROG}
-	./${PROG} 1 < westley.c > ver1.c
+	-./${PROG} 1 < westley.c > ver1.c
 	@echo "** NOTE: this version will not compile with clang **"
 	-${CC} ${CFLAGS} ver1.c -o $@ ${LIBS}
 
 ver2: ${PROG}
-	./${PROG} 1 2 < westley.c > ver2.c
+	-./${PROG} 1 2 < westley.c > ver2.c
 	@echo "** NOTE: this version will not compile with clang **"
 	-${CC} ${CFLAGS} ver2.c -o $@ ${LIBS}
 
 ver3: ${PROG}
-	./${PROG} 1 2 3 < westley.c > ver3.c
+	-./${PROG} 1 2 3 < westley.c > ver3.c
 	@echo "** NOTE: this version will not compile with clang **"
 	-${CC} ${CFLAGS} ver3.c -o $@ ${LIBS}
 
diff --git a/1990/baruch/.gitignore b/1990/baruch/.gitignore
index c31461210..4c7547c4e 100644
--- a/1990/baruch/.gitignore
+++ b/1990/baruch/.gitignore
@@ -1,2 +1,4 @@
 baruch
 baruch.alt
+baruch.orig
+prog.orig
diff --git a/1990/baruch/Makefile b/1990/baruch/Makefile
index 90662dd69..efe2aaf2c 100644
--- a/1990/baruch/Makefile
+++ b/1990/baruch/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-logical-op-parentheses \
-	-Wno-string-plus-int
+	-Wno-string-plus-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1990/cmills/.gitignore b/1990/cmills/.gitignore
index 931adc228..4dbfe182e 100644
--- a/1990/cmills/.gitignore
+++ b/1990/cmills/.gitignore
@@ -1 +1,3 @@
 cmills
+cmills.orig
+prog.orig
diff --git a/1990/cmills/Makefile b/1990/cmills/Makefile
index 491b4779d..ccb8fa2d9 100644
--- a/1990/cmills/Makefile
+++ b/1990/cmills/Makefile
@@ -38,8 +38,9 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-deprecated-declarations -Wno-parentheses -Wno-error -Wno-implicit-function-declaration \
-	-Wno-format-security -Wno-return-type -Wno-unused-value
+CSILENCE= -Wno-deprecated-declarations -Wno-parentheses -Wno-error \
+	-Wno-implicit-function-declaration -Wno-format-security -Wno-return-type \
+	-Wno-unused-value -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1990/dds/.gitignore b/1990/dds/.gitignore
index d7985d043..36e62c025 100644
--- a/1990/dds/.gitignore
+++ b/1990/dds/.gitignore
@@ -1 +1,3 @@
 dds
+dds.orig
+prog.orig
diff --git a/1990/dds/Makefile b/1990/dds/Makefile
index e5eff81f5..3c63fe438 100644
--- a/1990/dds/Makefile
+++ b/1990/dds/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-builtin-requires-header -Wno-char-subscripts -Wno-conditional-type-mismatch \
 	-Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
-	-Wno-incompatible-library-redeclaration -Wno-parentheses -Wno-implicit-int
+	-Wno-incompatible-library-redeclaration -Wno-parentheses -Wno-implicit-int \
+	-Wno-deprecated-non-prototype -Wno-return-type -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -85,7 +86,9 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-comma -Wno-missing-prototypes -Wno-missing-variable-declarations \
+	-Wno-poison-system-directories -Wno-shadow -Wno-shorten-64-to-32 \
+	-Wno-unreachable-code-return
 #
 CWARN+= -Weverything
 #
diff --git a/1990/dg/.gitignore b/1990/dg/.gitignore
index 943f7b015..a5524b15a 100644
--- a/1990/dg/.gitignore
+++ b/1990/dg/.gitignore
@@ -1 +1,3 @@
 dg
+dg.orig
+prog.orig
diff --git a/1990/dg/Makefile b/1990/dg/Makefile
index 14637625d..a75be545d 100644
--- a/1990/dg/Makefile
+++ b/1990/dg/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-invalid-pp-token
+CSILENCE= -Wno-invalid-pp-token -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -83,7 +83,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories -Wno-strict-prototypes
+CSILENCE+= -Wno-poison-system-directories -Wno-strict-prototypes \
+	-Wno-implicit-int-conversion -Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/1990/jaw/.gitignore b/1990/jaw/.gitignore
index a11ebfac1..22eb8875e 100644
--- a/1990/jaw/.gitignore
+++ b/1990/jaw/.gitignore
@@ -4,3 +4,5 @@ zcat
 receive
 unshark
 unshark.c
+jaw.orig
+prog.orig
diff --git a/1990/jaw/Makefile b/1990/jaw/Makefile
index b38c8d2cd..b0ddac970 100644
--- a/1990/jaw/Makefile
+++ b/1990/jaw/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
 	-Wno-logical-op-parentheses -Wno-parentheses -Wno-return-type \
-	-Wno-shift-op-parentheses
+	-Wno-shift-op-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1990/pjr/.gitignore b/1990/pjr/.gitignore
index f1d5f5301..dd02383e3 100644
--- a/1990/pjr/.gitignore
+++ b/1990/pjr/.gitignore
@@ -1 +1,3 @@
 pjr
+pjr.orig
+prog.orig
diff --git a/1990/pjr/Makefile b/1990/pjr/Makefile
index 603ba16b6..c8b70fc78 100644
--- a/1990/pjr/Makefile
+++ b/1990/pjr/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1990/scjones/.gitignore b/1990/scjones/.gitignore
index 1b2174ab1..57bc24fbb 100644
--- a/1990/scjones/.gitignore
+++ b/1990/scjones/.gitignore
@@ -1 +1,3 @@
 scjones
+scjones.orig
+prog.orig
diff --git a/1990/scjones/Makefile b/1990/scjones/Makefile
index 7c33eba0d..25a75f999 100644
--- a/1990/scjones/Makefile
+++ b/1990/scjones/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-invalid-pp-token -Wno-trigraphs
+CSILENCE= -Wno-invalid-pp-token -Wno-trigraphs -Wno-deprecated-non-prototype \
+	-Wno-pedantic -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -83,7 +84,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories
+CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories \
+	 -Wno-missing-prototypes
 #
 CWARN+= -Weverything
 #
diff --git a/1990/stig/.gitignore b/1990/stig/.gitignore
index e3cc04a9f..a12048487 100644
--- a/1990/stig/.gitignore
+++ b/1990/stig/.gitignore
@@ -1,3 +1,5 @@
 o
 o.c
 stig
+stig.orig
+prog.orig
diff --git a/1990/tbr/.gitignore b/1990/tbr/.gitignore
index 1e7f77674..01f95f739 100644
--- a/1990/tbr/.gitignore
+++ b/1990/tbr/.gitignore
@@ -1 +1,3 @@
 tbr
+tbr.orig
+prog.orig
diff --git a/1990/tbr/Makefile b/1990/tbr/Makefile
index 7454381f8..81018b27b 100644
--- a/1990/tbr/Makefile
+++ b/1990/tbr/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
-	-Wno-unused-value
+	-Wno-unused-value -Wno-deprecated-non-prototype -Wno-return-type
 
 # Common C compiler warning flags
 #
@@ -85,7 +85,8 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-missing-prototypes -Wno-missing-variable-declarations \
-	-Wno-pedantic -Wno-poison-system-directories -Wno-strict-prototypes
+	-Wno-pedantic -Wno-poison-system-directories -Wno-strict-prototypes \
+	-Wno-unreachable-code
 #
 CWARN+= -Weverything
 #
diff --git a/1990/theorem/.gitignore b/1990/theorem/.gitignore
index a9223bbb1..00f950eb6 100644
--- a/1990/theorem/.gitignore
+++ b/1990/theorem/.gitignore
@@ -6,3 +6,5 @@ sorter
 sorter.c
 theorem_bkp
 theorem_bkp.c
+theorem.orig
+prog.orig
diff --git a/1990/theorem/Makefile b/1990/theorem/Makefile
index 0afb8d29f..73fb35232 100644
--- a/1990/theorem/Makefile
+++ b/1990/theorem/Makefile
@@ -41,7 +41,8 @@ include ../../var.mk
 CSILENCE= -Wno-deprecated-declarations -Wno-empty-body -Wno-error -Wno-unused-value \
 	-Wno-implicit-function-declaration -Wno-incompatible-pointer-types \
 	-Wno-macro-redefined -Wno-parentheses -Wno-return-type -Wno-unused-parameter \
-	-Wno-empty-translation-unit -Wno-int-conversion
+	-Wno-empty-translation-unit -Wno-deprecated-non-prototype -Wno-int-conversion \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -89,7 +90,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-double-promotion -Wno-float-conversion \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-shadow -Wno-strict-prototypes \
-	-Wno-unreachable-code -Wno-unused-macros
+	-Wno-unreachable-code -Wno-unused-macros -Wno-implicit-float-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1990/westley/.gitignore b/1990/westley/.gitignore
index 2a0c890f9..745e11d2f 100644
--- a/1990/westley/.gitignore
+++ b/1990/westley/.gitignore
@@ -1 +1,3 @@
 westley
+westley.orig
+prog.orig
diff --git a/1990/westley/Makefile b/1990/westley/Makefile
index 82b953470..69b9c1359 100644
--- a/1990/westley/Makefile
+++ b/1990/westley/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
-	-Wno-unused-value -Wno-unused-variable
+	-Wno-unused-value -Wno-unused-variable -Wno-deprecated-non-prototype \
+	-Wno-uninitialized
 
 # Common C compiler warning flags
 #
@@ -84,7 +85,10 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-comma -Wno-float-conversion -Wno-missing-variable-declarations \
+	-Wno-poison-system-directories -Wno-shadow -Wno-sign-conversion \
+	-Wno-string-conversion -Wno-unreachable-code \
+	-Wno-unreachable-code-loop-increment
 #
 CWARN+= -Weverything
 #
diff --git a/1991/ant/.gitignore b/1991/ant/.gitignore
index 012fa24aa..2d27aa19f 100644
--- a/1991/ant/.gitignore
+++ b/1991/ant/.gitignore
@@ -1,2 +1,4 @@
 ant
 hill
+ant.orig
+prog.orig
diff --git a/1991/ant/Makefile b/1991/ant/Makefile
index 8c5aac894..1affc081b 100644
--- a/1991/ant/Makefile
+++ b/1991/ant/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-empty-body \
-	-Wno-implicit-function-declaration -Wno-return-type
+	-Wno-implicit-function-declaration -Wno-return-type \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1991/brnstnd/.gitignore b/1991/brnstnd/.gitignore
index 30030af9d..98ba8b35e 100644
--- a/1991/brnstnd/.gitignore
+++ b/1991/brnstnd/.gitignore
@@ -1 +1,3 @@
 brnstnd
+brnstnd.orig
+prog.orig
diff --git a/1991/brnstnd/Makefile b/1991/brnstnd/Makefile
index c1af9cd8c..e0786b43e 100644
--- a/1991/brnstnd/Makefile
+++ b/1991/brnstnd/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-c99-extensions -Wno-error -Wno-implicit-function-declaration \
-	-Wno-parentheses -Wno-return-type
+	-Wno-parentheses -Wno-return-type -Wno-deprecated-non-prototype -Wno-unused-value
 
 # Common C compiler warning flags
 #
@@ -86,7 +86,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-implicit-int-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-strict-prototypes
+	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-strict-prototypes \
+	-Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/1991/buzzard/.gitignore b/1991/buzzard/.gitignore
index 5caf57610..6e681b16b 100644
--- a/1991/buzzard/.gitignore
+++ b/1991/buzzard/.gitignore
@@ -1 +1,3 @@
 buzzard
+buzzard.orig
+prog.orig
diff --git a/1991/buzzard/Makefile b/1991/buzzard/Makefile
index 52d932383..d5d8a6c08 100644
--- a/1991/buzzard/Makefile
+++ b/1991/buzzard/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
 	-Wno-int-conversion -Wno-logical-op-parentheses -Wno-pedantic \
-	-Wno-return-type -Wno-unknown-escape-sequence -Wno-unused-value
+	-Wno-return-type -Wno-unknown-escape-sequence -Wno-unused-value \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1991/cdupont/.gitignore b/1991/cdupont/.gitignore
index 0c3243e3b..9accc2c55 100644
--- a/1991/cdupont/.gitignore
+++ b/1991/cdupont/.gitignore
@@ -1 +1,3 @@
 cdupont
+cdupont.orig
+prog.orig
diff --git a/1991/cdupont/Makefile b/1991/cdupont/Makefile
index b874994e2..546d7160a 100644
--- a/1991/cdupont/Makefile
+++ b/1991/cdupont/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-unused-label
+CSILENCE= -Wno-unused-label -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1991/davidguy/.gitignore b/1991/davidguy/.gitignore
index 77ebabb35..ad25838e8 100644
--- a/1991/davidguy/.gitignore
+++ b/1991/davidguy/.gitignore
@@ -1 +1,3 @@
 davidguy
+davidguy.orig
+prog.orig
diff --git a/1991/davidguy/Makefile b/1991/davidguy/Makefile
index b7790054f..9ae600e28 100644
--- a/1991/davidguy/Makefile
+++ b/1991/davidguy/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
-	-Wno-int-to-pointer-cast -Wno-return-type -Wno-sign-compare
+	-Wno-int-to-pointer-cast -Wno-return-type -Wno-sign-compare \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1991/dds/.gitignore b/1991/dds/.gitignore
index 2118681f1..c71d12ad5 100644
--- a/1991/dds/.gitignore
+++ b/1991/dds/.gitignore
@@ -3,3 +3,5 @@ dds.alt
 a
 a.c
 a.out
+dds.orig
+prog.orig
diff --git a/1991/dds/Makefile b/1991/dds/Makefile
index fdeddccef..0f4b8b9e7 100644
--- a/1991/dds/Makefile
+++ b/1991/dds/Makefile
@@ -38,8 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-overlength-strings \
-	-Wno-unused-parameter
+CSILENCE= -Wno-deprecated-non-prototype -Wno-unused-parameter \
+	-Wno-error -Wno-implicit-function-declaration
 
 # Common C compiler warning flags
 #
@@ -84,8 +84,9 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-implicit-int-conversion -Wno-missing-variable-declarations \
-	-Wno-pedantic -Wno-poison-system-directorie
+CSILENCE+= -Wno-deprecated-non-prototype -Wno-implicit-int-conversion \
+	-Wno-missing-variable-declarations -Wno-overlength-strings -Wno-pedantic \
+	-Wno-poison-system-directories -Wno-unused-parameter
 #
 CWARN+= -Weverything
 #
diff --git a/1991/fine/.gitignore b/1991/fine/.gitignore
index 86815ca75..693c74803 100644
--- a/1991/fine/.gitignore
+++ b/1991/fine/.gitignore
@@ -1 +1,3 @@
 fine
+fine.orig
+prog.orig
diff --git a/1991/rince/.gitignore b/1991/rince/.gitignore
index 8e87c9d18..c014262c4 100644
--- a/1991/rince/.gitignore
+++ b/1991/rince/.gitignore
@@ -1 +1,3 @@
 rince
+rince.orig
+prog.orig
diff --git a/1991/rince/Makefile b/1991/rince/Makefile
index f80abc5ce..cc6b162ac 100644
--- a/1991/rince/Makefile
+++ b/1991/rince/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1991/westley/.gitignore b/1991/westley/.gitignore
index ab0500ebf..71f95e6dc 100644
--- a/1991/westley/.gitignore
+++ b/1991/westley/.gitignore
@@ -7,3 +7,5 @@ ttt_game
 ttt_game.c
 westley
 ttt_old.c
+westley.orig
+prog.orig
diff --git a/1991/westley/Makefile b/1991/westley/Makefile
index 01f2a8ab5..592f05854 100644
--- a/1991/westley/Makefile
+++ b/1991/westley/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses \
-	-Wno-shift-op-parentheses -Wno-return-type
+	-Wno-shift-op-parentheses -Wno-return-type -Wno-deprecated-non-prototype \
+	-Wno-missing-braces
 
 # Common C compiler warning flags
 #
diff --git a/1992/adrian/.gitignore b/1992/adrian/.gitignore
index 9d3552f3e..097a1b287 100644
--- a/1992/adrian/.gitignore
+++ b/1992/adrian/.gitignore
@@ -22,3 +22,5 @@ adwc
 adwc.alt
 adwc.alt.c
 adwc.c
+adrian.orig
+prog.orig
diff --git a/1992/adrian/Makefile b/1992/adrian/Makefile
index 9e2e27f42..090fc340b 100644
--- a/1992/adrian/Makefile
+++ b/1992/adrian/Makefile
@@ -42,7 +42,8 @@ CSILENCE= -Wno-bitwise-op-parentheses -Wno-comment -Wno-deprecated-declarations
 	-Wno-error -Wno-implicit-function-declaration -Wno-format-security \
 	-Wno-logical-op-parentheses -Wno-macro-redefined -Wno-parentheses \
 	-Wno-return-type -Wno-uninitialized -Wno-unused-value -Wno-unused-variable \
-	-Wno-unused-but-set-variable -Wno-unsequenced -Wno-unused-parameter
+	-Wno-unused-but-set-variable -Wno-unsequenced -Wno-unused-parameter \
+	-Wno-empty-translation-unit
 
 # Common C compiler warning flags
 #
@@ -90,7 +91,8 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-float-conversion -Wno-missing-noreturn \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-padded \
 	-Wno-poison-system-directories -Wno-shadow -Wno-unreachable-code \
-	-Wno-unused-macros
+	-Wno-unused-macros -Wno-shorten-64-to-32 -Wno-sign-conversion \
+	-Wno-empty-translation-unit
 #
 CWARN+= -Weverything
 #
diff --git a/1992/albert/.gitignore b/1992/albert/.gitignore
index f6de83234..aa262d580 100644
--- a/1992/albert/.gitignore
+++ b/1992/albert/.gitignore
@@ -1 +1,3 @@
 albert
+albert.orig
+prog.orig
diff --git a/1992/albert/Makefile b/1992/albert/Makefile
index cd5f47f31..59fa8fdac 100644
--- a/1992/albert/Makefile
+++ b/1992/albert/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unused-parameter
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unused-parameter \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1992/ant/.gitignore b/1992/ant/.gitignore
index ef8f8b213..d421620bc 100644
--- a/1992/ant/.gitignore
+++ b/1992/ant/.gitignore
@@ -3,3 +3,5 @@ am.safe
 ant
 node.*
 leaf.*
+ant.orig
+prog.orig
diff --git a/1992/ant/Makefile b/1992/ant/Makefile
index e105d4de5..c7c1bff54 100644
--- a/1992/ant/Makefile
+++ b/1992/ant/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unsequenced
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unsequenced \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1992/buzzard.1/.gitignore b/1992/buzzard.1/.gitignore
index e5ab81324..d99f23885 100644
--- a/1992/buzzard.1/.gitignore
+++ b/1992/buzzard.1/.gitignore
@@ -2,3 +2,5 @@ babble
 babble.cppcb
 buzzard.1
 tmp
+buzzard.1.orig
+prog.orig
diff --git a/1992/buzzard.1/Makefile b/1992/buzzard.1/Makefile
index 3e3725591..6e16b946a 100644
--- a/1992/buzzard.1/Makefile
+++ b/1992/buzzard.1/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-pedantic \
-	-Wno-unused-parameter
+	-Wno-unused-parameter -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1992/buzzard.2/.gitignore b/1992/buzzard.2/.gitignore
index 4daf52b2f..174bc00a2 100644
--- a/1992/buzzard.2/.gitignore
+++ b/1992/buzzard.2/.gitignore
@@ -1,2 +1,4 @@
 buzzard.2
 first
+buzzard.2.orig
+prog.orig
diff --git a/1992/buzzard.2/Makefile b/1992/buzzard.2/Makefile
index 41dda73e5..b15ebd538 100644
--- a/1992/buzzard.2/Makefile
+++ b/1992/buzzard.2/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-pedantic \
-	-Wno-return-type
+	-Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1992/gson/.gitignore b/1992/gson/.gitignore
index bc269b571..dd540b95a 100644
--- a/1992/gson/.gitignore
+++ b/1992/gson/.gitignore
@@ -1,3 +1,5 @@
 gson
 ag
 words
+gson.orig
+prog.orig
diff --git a/1992/gson/Makefile b/1992/gson/Makefile
index 03ca1b210..d5a42c1db 100644
--- a/1992/gson/Makefile
+++ b/1992/gson/Makefile
@@ -41,7 +41,8 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-char-subscripts \
 	-Wno-deprecated-declarations -Wno-empty-body -Wno-error \
 	-Wno-implicit-function-declaration -Wno-parentheses -Wno-pedantic \
-	-Wno-return-type -Wno-unused-parameter -Wno-unused-value
+	-Wno-return-type -Wno-unused-parameter -Wno-unused-value \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1992/imc/.gitignore b/1992/imc/.gitignore
index 7bf566445..45bd3341b 100644
--- a/1992/imc/.gitignore
+++ b/1992/imc/.gitignore
@@ -1,3 +1,5 @@
 imc
 screen1.ras
 screen2.ras
+imc.orig
+prog.orig
diff --git a/1992/imc/Makefile b/1992/imc/Makefile
index 5acbaa5ba..ad3f6bbe4 100644
--- a/1992/imc/Makefile
+++ b/1992/imc/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -85,7 +86,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-error -Wno-implicit-function-declaration -Wno-format \
 	-Wno-missing-variable-declarations -Wno-poison-system-directorie \
-	-Wno-poison-system-directories -Wno-unknown-warning-option
+	-Wno-poison-system-directories -Wno-unknown-warning-option \
+	-Wno-float-conversion -Wno-shorten-64-to-32 -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1992/kivinen/.gitignore b/1992/kivinen/.gitignore
index d0ccb8fd5..afc417ed0 100644
--- a/1992/kivinen/.gitignore
+++ b/1992/kivinen/.gitignore
@@ -1 +1,3 @@
 kivinen
+kivinen.orig
+prog.orig
diff --git a/1992/kivinen/Makefile b/1992/kivinen/Makefile
index caef7a4dd..8a721aa7a 100644
--- a/1992/kivinen/Makefile
+++ b/1992/kivinen/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
-	-Wno-logical-op-parentheses -Wno-main -Wno-variadic-macros
+	-Wno-logical-op-parentheses -Wno-main -Wno-variadic-macros -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1992/lush/.gitignore b/1992/lush/.gitignore
index e80244fae..be32daf3b 100644
--- a/1992/lush/.gitignore
+++ b/1992/lush/.gitignore
@@ -1,2 +1,4 @@
 lush
 lush.alt
+lush.orig
+prog.orig
diff --git a/1992/lush/Makefile b/1992/lush/Makefile
index 17210a790..880722a7c 100644
--- a/1992/lush/Makefile
+++ b/1992/lush/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-macro-redefined
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-macro-redefined \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1992/marangon/.gitignore b/1992/marangon/.gitignore
index d5d39567a..2d0ac2cc4 100644
--- a/1992/marangon/.gitignore
+++ b/1992/marangon/.gitignore
@@ -1 +1,3 @@
 marangon
+marangon.orig
+prog.orig
diff --git a/1992/marangon/Makefile b/1992/marangon/Makefile
index 3bb0bf1f8..235bfaa1e 100644
--- a/1992/marangon/Makefile
+++ b/1992/marangon/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
 	-Wno-logical-op-parentheses -Wno-main-return-type -Wno-missing-braces \
 	-Wno-parentheses -Wno-return-type -Wno-tautological-bitwise-compare \
-	-Wno-unsequenced
+	-Wno-unsequenced -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1992/nathan/.gitignore b/1992/nathan/.gitignore
index 2abfe6cf3..2a635cb95 100644
--- a/1992/nathan/.gitignore
+++ b/1992/nathan/.gitignore
@@ -1 +1,3 @@
 nathan
+nathan.orig
+prog.orig
diff --git a/1992/nathan/Makefile b/1992/nathan/Makefile
index bcb63e46b..37f4588cb 100644
--- a/1992/nathan/Makefile
+++ b/1992/nathan/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -83,7 +83,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories
+CSILENCE+= -Wno-poison-system-directories -Wno-comma -Wno-shorten-64-to-32
 #
 CWARN+= -Weverything
 #
diff --git a/1992/vern/.gitignore b/1992/vern/.gitignore
index b287f41f9..b370c1ac4 100644
--- a/1992/vern/.gitignore
+++ b/1992/vern/.gitignore
@@ -1,2 +1,4 @@
 vern
 vern.tmp.c
+vern.orig
+prog.orig
diff --git a/1992/vern/Makefile b/1992/vern/Makefile
index 96c95403c..6e0523dad 100644
--- a/1992/vern/Makefile
+++ b/1992/vern/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-dangling-else -Wno-error \
 	-Wno-implicit-function-declaration -Wno-parentheses -Wno-pedantic \
-	-Wno-return-type -Wno-shift-op-parentheses
+	-Wno-return-type -Wno-shift-op-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1992/westley/.gitignore b/1992/westley/.gitignore
index 94fdec9d4..4b0d4e0d4 100644
--- a/1992/westley/.gitignore
+++ b/1992/westley/.gitignore
@@ -1,3 +1,5 @@
 westley
 whereami
 westley.alt
+westley.orig
+prog.orig
diff --git a/1992/westley/Makefile b/1992/westley/Makefile
index 5f33b142f..c2bd99396 100644
--- a/1992/westley/Makefile
+++ b/1992/westley/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
-	-Wno-parentheses -Wno-pedantic
+	-Wno-parentheses -Wno-pedantic -Wno-deprecated-non-prototype -Wno-int-conversion
 
 # Common C compiler warning flags
 #
@@ -84,7 +84,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories
+CSILENCE+= -Wno-poison-system-directories -Wno-int-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1993/ant/.gitignore b/1993/ant/.gitignore
index ee8d56390..30a97e7dc 100644
--- a/1993/ant/.gitignore
+++ b/1993/ant/.gitignore
@@ -2,3 +2,5 @@ ag
 ag.txt
 ant
 ant
+ant.orig
+prog.orig
diff --git a/1993/ant/Makefile b/1993/ant/Makefile
index 30dd0a104..9f975c375 100644
--- a/1993/ant/Makefile
+++ b/1993/ant/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration
+CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1993/cmills/.gitignore b/1993/cmills/.gitignore
index 931adc228..4dbfe182e 100644
--- a/1993/cmills/.gitignore
+++ b/1993/cmills/.gitignore
@@ -1 +1,3 @@
 cmills
+cmills.orig
+prog.orig
diff --git a/1993/cmills/Makefile b/1993/cmills/Makefile
index 07b6a5a9b..d8a9aba58 100644
--- a/1993/cmills/Makefile
+++ b/1993/cmills/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-return-type
+CSILENCE= -Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1993/dgibson/.gitignore b/1993/dgibson/.gitignore
index 693629c2d..686bb0560 100644
--- a/1993/dgibson/.gitignore
+++ b/1993/dgibson/.gitignore
@@ -1,3 +1,5 @@
 data.name
 dgibson
 life.d 
+dgibson.orig
+prog.orig
diff --git a/1993/ejb/.gitignore b/1993/ejb/.gitignore
index a05a37517..398a2bf1f 100644
--- a/1993/ejb/.gitignore
+++ b/1993/ejb/.gitignore
@@ -1 +1,3 @@
 ejb
+ejb.orig
+prog.orig
diff --git a/1993/jonth/.gitignore b/1993/jonth/.gitignore
index fb51ec603..c3ee28755 100644
--- a/1993/jonth/.gitignore
+++ b/1993/jonth/.gitignore
@@ -1,2 +1,4 @@
 jonth
 jonth.tmp.c
+jonth.orig
+prog.orig
diff --git a/1993/jonth/Makefile b/1993/jonth/Makefile
index e8cc9660e..1c90522b2 100644
--- a/1993/jonth/Makefile
+++ b/1993/jonth/Makefile
@@ -39,7 +39,10 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration \
-	-Wno-incompatible-pointer-types -Wno-int-conversion
+	-Wno-incompatible-pointer-types -Wno-int-conversion \
+	-Wno-c99-extensions -Wno-deprecated-declarations \
+        -Wno-deprecated-non-prototype -Wno-format -Wno-pedantic -Wno-return-type \
+        -Wno-strict-prototypes -Wno-unused-variable
 
 # Common C compiler warning flags
 #
@@ -87,7 +90,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-cast-align -Wno-comma -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-sign-conversion -Wno-strict-prototypes
+	-Wno-sign-conversion -Wno-strict-prototypes \
+	-Wno-implicit-int-conversion -Wno-shadow -Wno-shorten-64-to-32
 #
 CWARN+= -Weverything
 #
diff --git a/1993/leo/.gitignore b/1993/leo/.gitignore
index 25fbf06a1..5f9e511dd 100644
--- a/1993/leo/.gitignore
+++ b/1993/leo/.gitignore
@@ -1,2 +1,4 @@
 leo
 mind
+leo.orig
+prog.orig
diff --git a/1993/lmfjyh/.gitignore b/1993/lmfjyh/.gitignore
index c52e85481..638878a76 100644
--- a/1993/lmfjyh/.gitignore
+++ b/1993/lmfjyh/.gitignore
@@ -1,3 +1,5 @@
 "*
 lmfjyh
 lmfjyh.alt
+lmfjyh.orig
+prog.orig
diff --git a/1993/lmfjyh/Makefile b/1993/lmfjyh/Makefile
index 23b624bac..9a9b2dea6 100644
--- a/1993/lmfjyh/Makefile
+++ b/1993/lmfjyh/Makefile
@@ -83,7 +83,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories
 #
 CWARN+= -Weverything
 #
diff --git a/1993/plummer/.gitignore b/1993/plummer/.gitignore
index 6d2000905..7db60a5bd 100644
--- a/1993/plummer/.gitignore
+++ b/1993/plummer/.gitignore
@@ -1,2 +1,4 @@
 plummer
 plummer.alt
+plummer.orig
+prog.orig
diff --git a/1993/plummer/Makefile b/1993/plummer/Makefile
index d67c1bdd9..f5168fe24 100644
--- a/1993/plummer/Makefile
+++ b/1993/plummer/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format-security
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format-security \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1993/rince/.gitignore b/1993/rince/.gitignore
index f836e3057..7b03e212b 100644
--- a/1993/rince/.gitignore
+++ b/1993/rince/.gitignore
@@ -1,2 +1,4 @@
 jkb
 rince
+rince.orig
+prog.orig
diff --git a/1993/schnitzi/.gitignore b/1993/schnitzi/.gitignore
index 563ae8705..8eb45f60f 100644
--- a/1993/schnitzi/.gitignore
+++ b/1993/schnitzi/.gitignore
@@ -1 +1,3 @@
 schnitzi
+schnitzi.orig
+prog.orig
diff --git a/1993/schnitzi/Makefile b/1993/schnitzi/Makefile
index 345b26c31..09c3a2e12 100644
--- a/1993/schnitzi/Makefile
+++ b/1993/schnitzi/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-deprecated-declarations -Wno-pedantic
+CSILENCE= -Wno-deprecated-declarations -Wno-pedantic -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1993/vanb/.gitignore b/1993/vanb/.gitignore
index c0fa8eb22..43ddaba26 100644
--- a/1993/vanb/.gitignore
+++ b/1993/vanb/.gitignore
@@ -1 +1,3 @@
 vanb
+vanb.orig
+prog.orig
diff --git a/1993/vanb/Makefile b/1993/vanb/Makefile
index 6c002bcd8..aa07f55a3 100644
--- a/1993/vanb/Makefile
+++ b/1993/vanb/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-deprecated-non-prototype -Wno-unused-value
 
 # Common C compiler warning flags
 #
@@ -83,7 +83,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-comma -Wno-pedantic -Wno-poison-system-directories
+CSILENCE+= -Wno-comma -Wno-pedantic -Wno-poison-system-directories \
+	-Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-shadow
 #
 CWARN+= -Weverything
 #
diff --git a/1994/dodsond1/.gitignore b/1994/dodsond1/.gitignore
index e95d5d7e8..26b7faebe 100644
--- a/1994/dodsond1/.gitignore
+++ b/1994/dodsond1/.gitignore
@@ -1 +1,3 @@
 dodsond1
+dodsond1.orig
+prog.orig
diff --git a/1994/dodsond1/Makefile b/1994/dodsond1/Makefile
index 8591966ee..a6671e159 100644
--- a/1994/dodsond1/Makefile
+++ b/1994/dodsond1/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
-	-Wno-missing-braces -Wno-return-type
+	-Wno-missing-braces -Wno-return-type -Wno-deprecated-non-prototype \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1994/dodsond2/.gitignore b/1994/dodsond2/.gitignore
index 66d8e0add..e2294cd67 100644
--- a/1994/dodsond2/.gitignore
+++ b/1994/dodsond2/.gitignore
@@ -1 +1,3 @@
 dodsond2
+dodsond2.orig
+prog.orig
diff --git a/1994/dodsond2/Makefile b/1994/dodsond2/Makefile
index 351170a05..9395ab879 100644
--- a/1994/dodsond2/Makefile
+++ b/1994/dodsond2/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-return-type
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-return-type \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1994/horton/.gitignore b/1994/horton/.gitignore
index 685074b78..d39e2224f 100644
--- a/1994/horton/.gitignore
+++ b/1994/horton/.gitignore
@@ -1,3 +1,5 @@
 gtface
 horton
 horton.alt
+horton.orig
+prog.orig
diff --git a/1994/horton/Makefile b/1994/horton/Makefile
index 87885fef9..d8a9aa438 100644
--- a/1994/horton/Makefile
+++ b/1994/horton/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unused-parameter \
 	-Wno-missing-braces -Wno-return-type -Wno-unused-but-set-variable \
-	-Wno-unused-variable
+	-Wno-unused-variable -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1994/imc/.gitignore b/1994/imc/.gitignore
index eb3fb586e..4cc262407 100644
--- a/1994/imc/.gitignore
+++ b/1994/imc/.gitignore
@@ -1 +1,3 @@
 imc
+imc.orig
+prog.orig
diff --git a/1994/imc/Makefile b/1994/imc/Makefile
index 6d3d7d909..d7fe2cf30 100644
--- a/1994/imc/Makefile
+++ b/1994/imc/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration
+CSILENCE= -Wno-error -Wno-implicit-function-declaration \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1994/ldb/.gitignore b/1994/ldb/.gitignore
index 9fa76f9f8..5e8bf72a4 100644
--- a/1994/ldb/.gitignore
+++ b/1994/ldb/.gitignore
@@ -1,2 +1,4 @@
 ldb
 ldb.alt
+ldb.orig
+prog.orig
diff --git a/1994/ldb/Makefile b/1994/ldb/Makefile
index 09ddf4d3b..07f5f7e8f 100644
--- a/1994/ldb/Makefile
+++ b/1994/ldb/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-trigraphs -Wno-int-conversion
+CSILENCE= -Wno-trigraphs -Wno-incompatible-pointer-types -Wno-int-conversion \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -83,7 +84,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories
+CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories \
+	-Wno-comma -Wno-shorten-64-to-32
 #
 CWARN+= -Weverything
 #
diff --git a/1994/schnitzi/.gitignore b/1994/schnitzi/.gitignore
index 83b4fdd34..3c5531585 100644
--- a/1994/schnitzi/.gitignore
+++ b/1994/schnitzi/.gitignore
@@ -1,2 +1,4 @@
 schnitzi
 schnitzi.alt
+schnitzi.orig
+prog.orig
diff --git a/1994/schnitzi/Makefile b/1994/schnitzi/Makefile
index 0dcaaad8a..1b269b79f 100644
--- a/1994/schnitzi/Makefile
+++ b/1994/schnitzi/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-deprecated-declarations -Wno-error -Wno-implicit-function-declaration
+CSILENCE= -Wno-deprecated-declarations -Wno-error -Wno-implicit-function-declaration \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1994/shapiro/.gitignore b/1994/shapiro/.gitignore
index 784ac9419..befeeb4bc 100644
--- a/1994/shapiro/.gitignore
+++ b/1994/shapiro/.gitignore
@@ -1,3 +1,5 @@
 shapiro
 shapiro_t1
 shapiro_t2.c
+shapiro.orig
+prog.orig
diff --git a/1994/shapiro/Makefile b/1994/shapiro/Makefile
index 2c9c3adc0..7de8cb116 100644
--- a/1994/shapiro/Makefile
+++ b/1994/shapiro/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-shift-op-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-shift-op-parentheses \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1994/smr/.gitignore b/1994/smr/.gitignore
index c1b3da72a..82da59856 100644
--- a/1994/smr/.gitignore
+++ b/1994/smr/.gitignore
@@ -1,2 +1,4 @@
 smr
 smr.out
+smr.orig
+prog.orig
diff --git a/1994/tvr/.gitignore b/1994/tvr/.gitignore
index 925bd5602..d21da422a 100644
--- a/1994/tvr/.gitignore
+++ b/1994/tvr/.gitignore
@@ -1,2 +1,4 @@
 tvr
 tvr.alt
+tvr.orig
+prog.orig
diff --git a/1994/tvr/Makefile b/1994/tvr/Makefile
index 7ce8404d9..3c0484f41 100644
--- a/1994/tvr/Makefile
+++ b/1994/tvr/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-main-return-type \
 	-Wno-sign-compare -Wno-string-plus-int -Wno-unsequenced -Wno-unused-variable \
-    -Wno-incompatible-pointer-types
+	-Wno-incompatible-pointer-types -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -88,7 +88,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-conditional-uninitialized -Wno-implicit-int-conversion \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-shadow -Wno-shorten-64-to-32 \
-	-Wno-sign-conversion -Wno-strict-prototypes
+	-Wno-sign-conversion -Wno-strict-prototypes -Wno-missing-noreturn
 #
 CWARN+= -Weverything
 #
diff --git a/1994/weisberg/.gitignore b/1994/weisberg/.gitignore
index 114557979..250a33e42 100644
--- a/1994/weisberg/.gitignore
+++ b/1994/weisberg/.gitignore
@@ -1,2 +1,4 @@
 weisberg
 weisberg.alt
+weisberg.orig
+prog.orig
diff --git a/1994/weisberg/Makefile b/1994/weisberg/Makefile
index e41a6f832..9bf23ca8b 100644
--- a/1994/weisberg/Makefile
+++ b/1994/weisberg/Makefile
@@ -86,7 +86,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-comma -Wno-poison-system-directories \
+CSILENCE+= -Wno-comma -Wno-poison-system-directories -Wno-shift-sign-overflow \
 	-Wno-conditional-uninitialized -Wno-pedantic
 #
 CWARN+= -Weverything
diff --git a/1994/westley/.gitignore b/1994/westley/.gitignore
index 2a0c890f9..745e11d2f 100644
--- a/1994/westley/.gitignore
+++ b/1994/westley/.gitignore
@@ -1 +1,3 @@
 westley
+westley.orig
+prog.orig
diff --git a/1994/westley/Makefile b/1994/westley/Makefile
index e3b76d4d1..d303fa01a 100644
--- a/1994/westley/Makefile
+++ b/1994/westley/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-poison-system-directories -Wno-undef
 
 # Common C compiler warning flags
 #
diff --git a/1995/cdua/.gitignore b/1995/cdua/.gitignore
index e71986dfb..21ae42e19 100644
--- a/1995/cdua/.gitignore
+++ b/1995/cdua/.gitignore
@@ -1,2 +1,4 @@
 cdua
 cdua.alt
+cdua.orig
+prog.orig
diff --git a/1995/cdua/Makefile b/1995/cdua/Makefile
index 32a8d73dc..198662fd6 100644
--- a/1995/cdua/Makefile
+++ b/1995/cdua/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-incompatible-library-redeclaration -Wno-main
+CSILENCE= -Wno-incompatible-library-redeclaration -Wno-main \
+	-Wno-deprecated-non-prototype -Wno-format-security -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -84,7 +85,8 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-strict-prototypes \
+	-Wno-format-nonliteral -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1995/dodsond1/.gitignore b/1995/dodsond1/.gitignore
index e95d5d7e8..26b7faebe 100644
--- a/1995/dodsond1/.gitignore
+++ b/1995/dodsond1/.gitignore
@@ -1 +1,3 @@
 dodsond1
+dodsond1.orig
+prog.orig
diff --git a/1995/dodsond1/Makefile b/1995/dodsond1/Makefile
index 8cb83ddac..2d330624c 100644
--- a/1995/dodsond1/Makefile
+++ b/1995/dodsond1/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration
+CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1995/dodsond2/.gitignore b/1995/dodsond2/.gitignore
index 66d8e0add..e2294cd67 100644
--- a/1995/dodsond2/.gitignore
+++ b/1995/dodsond2/.gitignore
@@ -1 +1,3 @@
 dodsond2
+dodsond2.orig
+prog.orig
diff --git a/1995/dodsond2/Makefile b/1995/dodsond2/Makefile
index 9be348334..7dd200242 100644
--- a/1995/dodsond2/Makefile
+++ b/1995/dodsond2/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-shift-op-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-shift-op-parentheses \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1995/esde/.gitignore b/1995/esde/.gitignore
index cef3ba5b0..f515d9de4 100644
--- a/1995/esde/.gitignore
+++ b/1995/esde/.gitignore
@@ -1 +1,3 @@
 esde
+esde.orig
+prog.orig
diff --git a/1995/garry/.gitignore b/1995/garry/.gitignore
index 114af9271..723db6bbb 100644
--- a/1995/garry/.gitignore
+++ b/1995/garry/.gitignore
@@ -1,2 +1,4 @@
 garry
 garry.alt
+garry.orig
+prog.orig
diff --git a/1995/garry/Makefile b/1995/garry/Makefile
index be0af1e81..7e99d5b63 100644
--- a/1995/garry/Makefile
+++ b/1995/garry/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-extra-semi -Wno-fortify-source -Wno-return-type
+CSILENCE= -Wno-extra-semi -Wno-fortify-source -Wno-return-type -Wno-strict-prototypes \
+	-Wno-unused-variable
 
 # Common C compiler warning flags
 #
diff --git a/1995/heathbar/.gitignore b/1995/heathbar/.gitignore
index 4037f15f0..9bfc99bbe 100644
--- a/1995/heathbar/.gitignore
+++ b/1995/heathbar/.gitignore
@@ -1 +1,3 @@
 heathbar
+heathbar.orig
+prog.orig
diff --git a/1995/leo/.gitignore b/1995/leo/.gitignore
index d26b7dc79..53c03ba31 100644
--- a/1995/leo/.gitignore
+++ b/1995/leo/.gitignore
@@ -1 +1,3 @@
 leo
+leo.orig
+prog.orig
diff --git a/1995/makarios/.gitignore b/1995/makarios/.gitignore
index c1edbccda..47d9c2177 100644
--- a/1995/makarios/.gitignore
+++ b/1995/makarios/.gitignore
@@ -1 +1,3 @@
 makarios
+makarios.orig
+prog.orig
diff --git a/1995/savastio/.gitignore b/1995/savastio/.gitignore
index 4e2dcaafa..ba799e98f 100644
--- a/1995/savastio/.gitignore
+++ b/1995/savastio/.gitignore
@@ -1 +1,3 @@
 savastio
+savastio.orig
+prog.orig
diff --git a/1995/savastio/Makefile b/1995/savastio/Makefile
index 18e640c1a..cf3ae9778 100644
--- a/1995/savastio/Makefile
+++ b/1995/savastio/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-format -Wno-incompatible-library-redeclaration \
-	-Wno-non-literal-null-conversion
+	-Wno-non-literal-null-conversion -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1995/schnitzi/.gitignore b/1995/schnitzi/.gitignore
index 563ae8705..8eb45f60f 100644
--- a/1995/schnitzi/.gitignore
+++ b/1995/schnitzi/.gitignore
@@ -1 +1,3 @@
 schnitzi
+schnitzi.orig
+prog.orig
diff --git a/1995/schnitzi/Makefile b/1995/schnitzi/Makefile
index a579e84e3..f93f0dda3 100644
--- a/1995/schnitzi/Makefile
+++ b/1995/schnitzi/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-int-conversion \
-	-Wno-logical-op-parentheses
+	-Wno-logical-op-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1995/spinellis/.gitignore b/1995/spinellis/.gitignore
index 5cf5145a5..6e62c02f6 100644
--- a/1995/spinellis/.gitignore
+++ b/1995/spinellis/.gitignore
@@ -1 +1,3 @@
 spinellis
+spinellis.orig
+prog.orig
diff --git a/1995/spinellis/Makefile b/1995/spinellis/Makefile
index a359e0258..49b0a6e1a 100644
--- a/1995/spinellis/Makefile
+++ b/1995/spinellis/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body
+CSILENCE= -Wno-empty-body -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1995/vanschnitz/.gitignore b/1995/vanschnitz/.gitignore
index a2fcd7db7..bffc28628 100644
--- a/1995/vanschnitz/.gitignore
+++ b/1995/vanschnitz/.gitignore
@@ -1 +1,3 @@
 vanschnitz
+vanschnitz.orig
+prog.orig
diff --git a/1995/vanschnitz/Makefile b/1995/vanschnitz/Makefile
index 7001aaad8..4c6122aab 100644
--- a/1995/vanschnitz/Makefile
+++ b/1995/vanschnitz/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-extra-tokens \
-	-Wno-overlength-strings
+	-Wno-overlength-strings -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1996/august/.gitignore b/1996/august/.gitignore
index 0b5694ffe..998a9e707 100644
--- a/1996/august/.gitignore
+++ b/1996/august/.gitignore
@@ -6,3 +6,5 @@ parse.oo
 prog.oc
 august.oo
 prog.oo
+august.orig
+prog.orig
diff --git a/1996/august/Makefile b/1996/august/Makefile
index 3200372aa..1a78eff29 100644
--- a/1996/august/Makefile
+++ b/1996/august/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-invalid-source-encoding -Wno-invalid-utf8
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-invalid-source-encoding \
+	-Wno-invalid-utf8 -Wno-strict-prototypes -Wno-unknown-warning-option
 
 # Common C compiler warning flags
 #
diff --git a/1996/dalbec/.gitignore b/1996/dalbec/.gitignore
index 9740628a3..465bc239b 100644
--- a/1996/dalbec/.gitignore
+++ b/1996/dalbec/.gitignore
@@ -1 +1,3 @@
 dalbec
+dalbec.orig
+prog.orig
diff --git a/1996/eldby/.gitignore b/1996/eldby/.gitignore
index e3f55ca6d..bfc768fda 100644
--- a/1996/eldby/.gitignore
+++ b/1996/eldby/.gitignore
@@ -1,2 +1,4 @@
 eldby
 eldby.alt
+eldby.orig
+prog.orig
diff --git a/1996/eldby/Makefile b/1996/eldby/Makefile
index a6d42c6ed..a80768160 100644
--- a/1996/eldby/Makefile
+++ b/1996/eldby/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
-	-Wno-return-type -Wno-unsequenced
+	-Wno-return-type -Wno-unsequenced -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1996/gandalf/.gitignore b/1996/gandalf/.gitignore
index ea4789acc..52f179143 100644
--- a/1996/gandalf/.gitignore
+++ b/1996/gandalf/.gitignore
@@ -1,3 +1,5 @@
 cathat
 gandalf
 hatcat
+gandalf.orig
+prog.orig
diff --git a/1996/gandalf/Makefile b/1996/gandalf/Makefile
index f37086de9..53113922e 100644
--- a/1996/gandalf/Makefile
+++ b/1996/gandalf/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-keyword-macro \
-	-Wno-shift-op-parentheses -Wno-unused-parameter
+	-Wno-shift-op-parentheses -Wno-unused-parameter \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes -Wno-unsequenced
 
 # Common C compiler warning flags
 #
@@ -85,7 +86,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-missing-prototypes -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-strict-prototypes -Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/1996/huffman/.gitignore b/1996/huffman/.gitignore
index 1f0e8c24c..edcf605cf 100644
--- a/1996/huffman/.gitignore
+++ b/1996/huffman/.gitignore
@@ -1 +1,3 @@
 huffman
+huffman.orig
+prog.orig
diff --git a/1996/huffman/Makefile b/1996/huffman/Makefile
index bdfa9796a..1910797f9 100644
--- a/1996/huffman/Makefile
+++ b/1996/huffman/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1996/jonth/.gitignore b/1996/jonth/.gitignore
index e2b0f9ceb..92ff97b73 100644
--- a/1996/jonth/.gitignore
+++ b/1996/jonth/.gitignore
@@ -1 +1,3 @@
 jonth
+jonth.orig
+prog.orig
diff --git a/1996/jonth/Makefile b/1996/jonth/Makefile
index 06d6261cb..50dd6e49e 100644
--- a/1996/jonth/Makefile
+++ b/1996/jonth/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
 	-Wno-infinite-recursion -Wno-return-type -Wno-string-plus-int \
-	-Wno-unsequenced -Wno-unused-parameter
+	-Wno-unsequenced -Wno-unused-parameter -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1996/rcm/.gitignore b/1996/rcm/.gitignore
index 13274c8d4..327ca9462 100644
--- a/1996/rcm/.gitignore
+++ b/1996/rcm/.gitignore
@@ -1 +1,3 @@
 rcm
+rcm.orig
+prog.orig
diff --git a/1996/rcm/Makefile b/1996/rcm/Makefile
index 84da3e0ef..5619f1567 100644
--- a/1996/rcm/Makefile
+++ b/1996/rcm/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body -Wno-shift-op-parentheses
+CSILENCE= -Wno-empty-body -Wno-shift-op-parentheses -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1996/schweikh1/.gitignore b/1996/schweikh1/.gitignore
index 72fbca3a7..c75ce18e0 100644
--- a/1996/schweikh1/.gitignore
+++ b/1996/schweikh1/.gitignore
@@ -1 +1,3 @@
 schweikh1
+schweikh1.orig
+prog.orig
diff --git a/1996/schweikh2/.gitignore b/1996/schweikh2/.gitignore
index 85e3bc2d7..1a4299c79 100644
--- a/1996/schweikh2/.gitignore
+++ b/1996/schweikh2/.gitignore
@@ -1 +1,3 @@
 schweikh2
+schweikh2.orig
+prog.orig
diff --git a/1996/schweikh3/.gitignore b/1996/schweikh3/.gitignore
index fc8e75c24..f9a41d6d3 100644
--- a/1996/schweikh3/.gitignore
+++ b/1996/schweikh3/.gitignore
@@ -1 +1,3 @@
 schweikh3
+schweikh3.orig
+prog.orig
diff --git a/1996/westley/.gitignore b/1996/westley/.gitignore
index 0c08f64e6..9b69ec7c5 100644
--- a/1996/westley/.gitignore
+++ b/1996/westley/.gitignore
@@ -1,2 +1,4 @@
 westley
 westley.alt
+westley.orig
+prog.orig
diff --git a/1996/westley/Makefile b/1996/westley/Makefile
index 7ffc7cc66..058007466 100644
--- a/1996/westley/Makefile
+++ b/1996/westley/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
-	-Wno-int-to-pointer-cast -Wno-empty-body
+	-Wno-int-to-pointer-cast -Wno-empty-body -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1998/banks/.gitignore b/1998/banks/.gitignore
index 7e81db4f3..dd0262e55 100644
--- a/1998/banks/.gitignore
+++ b/1998/banks/.gitignore
@@ -1,2 +1,4 @@
 banks
 banks.alt
+banks.orig
+prog.orig
diff --git a/1998/banks/Makefile b/1998/banks/Makefile
index d54cfdbad..bf5705eb2 100644
--- a/1998/banks/Makefile
+++ b/1998/banks/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
-	-Wno-unsequenced -Wno-incompatible-pointer-types
+	-Wno-unsequenced -Wno-incompatible-pointer-types \
+	-Wno-bitwise-instead-of-logical -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1998/bas1/.gitignore b/1998/bas1/.gitignore
index c3202efb6..f0c8d3ee5 100644
--- a/1998/bas1/.gitignore
+++ b/1998/bas1/.gitignore
@@ -1 +1,3 @@
 bas1
+bas1.orig
+prog.orig
diff --git a/1998/bas1/Makefile b/1998/bas1/Makefile
index 1e73724e9..40fc4359f 100644
--- a/1998/bas1/Makefile
+++ b/1998/bas1/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-bitwise-op-parentheses \
 	-Wno-empty-body -Wno-invalid-source-encoding -Wno-main -Wno-parentheses \
-	-Wno-shift-op-parentheses
+	-Wno-shift-op-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1998/bas2/.gitignore b/1998/bas2/.gitignore
index be2054eb2..568a89784 100644
--- a/1998/bas2/.gitignore
+++ b/1998/bas2/.gitignore
@@ -1 +1,3 @@
 bas2
+bas2.orig
+prog.orig
diff --git a/1998/bas2/Makefile b/1998/bas2/Makefile
index 2f0969f96..43c0b178d 100644
--- a/1998/bas2/Makefile
+++ b/1998/bas2/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-main
+CSILENCE= -Wno-main -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/1998/chaos/.gitignore b/1998/chaos/.gitignore
index 92e8ec1bd..e2f90f8c5 100644
--- a/1998/chaos/.gitignore
+++ b/1998/chaos/.gitignore
@@ -1,3 +1,5 @@
 chaos
 chaos_nohalf
 chaos_nohalf.c
+chaos.orig
+prog.orig
diff --git a/1998/df/.gitignore b/1998/df/.gitignore
index 781e137cc..b35a35643 100644
--- a/1998/df/.gitignore
+++ b/1998/df/.gitignore
@@ -1 +1,3 @@
 df
+df.orig
+prog.orig
diff --git a/1998/df/Makefile b/1998/df/Makefile
index 0a469874c..58e1388e3 100644
--- a/1998/df/Makefile
+++ b/1998/df/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-char-subscripts -Wno-pointer-to-int-cast \
-	-Wno-return-type -Wno-unused-parameter -Wno-unused-variable -Wno-typedef-redefinition
+	-Wno-return-type -Wno-unused-parameter -Wno-unused-variable \
+	-Wno-typedef-redefinition -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -88,7 +89,7 @@ CSILENCE+= -Wno-array-bounds-pointer-arithmetic -Wno-implicit-int-conversion \
 	-Wno-keyword-macro -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-pedantic \
 	-Wno-poison-system-directories -Wno-shadow -Wno-sign-conversion \
-	-Wno-strict-prototypes
+	-Wno-strict-prototypes -Wno-cast-function-type
 #
 CWARN+= -Weverything
 #
diff --git a/1998/dlowe/.gitignore b/1998/dlowe/.gitignore
index b24712c80..929663f8b 100644
--- a/1998/dlowe/.gitignore
+++ b/1998/dlowe/.gitignore
@@ -1,3 +1,5 @@
 dlowe
 dlowe.alt
 README.poot.md
+dlowe.orig
+prog.orig
diff --git a/1998/dlowe/Makefile b/1998/dlowe/Makefile
index 2f3f1f92d..6b7b3432d 100644
--- a/1998/dlowe/Makefile
+++ b/1998/dlowe/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-main-return-type
+CSILENCE= -Wno-main-return-type -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1998/dloweneil/.gitignore b/1998/dloweneil/.gitignore
index 1aaa3bc31..676bf2632 100644
--- a/1998/dloweneil/.gitignore
+++ b/1998/dloweneil/.gitignore
@@ -1,2 +1,4 @@
 dloweneil
 pootris
+dloweneil.orig
+prog.orig
diff --git a/1998/dorssel/.gitignore b/1998/dorssel/.gitignore
index 0a2f15060..5e82ae813 100644
--- a/1998/dorssel/.gitignore
+++ b/1998/dorssel/.gitignore
@@ -1 +1,3 @@
 dorssel
+dorssel.orig
+prog.orig
diff --git a/1998/dorssel/Makefile b/1998/dorssel/Makefile
index 3bfaeef52..93dbc15e3 100644
--- a/1998/dorssel/Makefile
+++ b/1998/dorssel/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses \
-	-Wno-shift-op-parentheses
+	-Wno-shift-op-parentheses -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/1998/fanf/.gitignore b/1998/fanf/.gitignore
index a3a1fc43b..f98d7a426 100644
--- a/1998/fanf/.gitignore
+++ b/1998/fanf/.gitignore
@@ -1,3 +1,5 @@
 fanf
 fanftmp1.c
 fanftmp2.c
+fanf.orig
+prog.orig
diff --git a/1998/schnitzi/.gitignore b/1998/schnitzi/.gitignore
index f646104a4..724675963 100644
--- a/1998/schnitzi/.gitignore
+++ b/1998/schnitzi/.gitignore
@@ -2,3 +2,5 @@ data
 schnitzi
 sort
 sort.c
+schnitzi.orig
+prog.orig
diff --git a/1998/schnitzi/Makefile b/1998/schnitzi/Makefile
index 2fc43b251..f9b1247ed 100644
--- a/1998/schnitzi/Makefile
+++ b/1998/schnitzi/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format-security \
-	-Wno-int-to-pointer-cast -Wno-int-conversion -Wno-unused-parameter
+	-Wno-int-to-pointer-cast -Wno-int-conversion -Wno-unused-parameter \
+	-Wno-incompatible-pointer-types
 
 # Common C compiler warning flags
 #
@@ -86,7 +87,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-implicit-int-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-pedantic \
-	-Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-strict-prototypes \
+	-Wno-cast-align
 #
 CWARN+= -Weverything
 #
diff --git a/1998/schweikh1/.gitignore b/1998/schweikh1/.gitignore
index 1c3b8754f..a53a9fe4e 100644
--- a/1998/schweikh1/.gitignore
+++ b/1998/schweikh1/.gitignore
@@ -1,2 +1,4 @@
 schweikh1
 schweikh1.alt
+schweikh1.orig
+prog.orig
diff --git a/1998/schweikh1/Makefile b/1998/schweikh1/Makefile
index 5057371bc..73bea14ee 100644
--- a/1998/schweikh1/Makefile
+++ b/1998/schweikh1/Makefile
@@ -83,7 +83,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories
+CSILENCE+= -Wno-poison-system-directories -Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/1998/schweikh2/.gitignore b/1998/schweikh2/.gitignore
index 85e3bc2d7..1a4299c79 100644
--- a/1998/schweikh2/.gitignore
+++ b/1998/schweikh2/.gitignore
@@ -1 +1,3 @@
 schweikh2
+schweikh2.orig
+prog.orig
diff --git a/1998/schweikh2/Makefile b/1998/schweikh2/Makefile
index d0ebca79b..ee35efb95 100644
--- a/1998/schweikh2/Makefile
+++ b/1998/schweikh2/Makefile
@@ -83,7 +83,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories -Wno-unused-macros -Wno-sign-conversion
+CSILENCE+= -Wno-poison-system-directories -Wno-unused-macros -Wno-sign-conversion \
+	-Wno-cast-function-type
 #
 CWARN+= -Weverything
 #
diff --git a/1998/schweikh3/.gitignore b/1998/schweikh3/.gitignore
index 30f4eadf5..07db08510 100644
--- a/1998/schweikh3/.gitignore
+++ b/1998/schweikh3/.gitignore
@@ -3,3 +3,5 @@ file1
 file2
 file3
 file4
+schweikh3.orig
+prog.orig
diff --git a/1998/schweikh3/Makefile b/1998/schweikh3/Makefile
index 6e43ef50b..31c5c46ce 100644
--- a/1998/schweikh3/Makefile
+++ b/1998/schweikh3/Makefile
@@ -84,7 +84,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-padded -Wno-poison-system-directories -Wno-shorten-64-to-32 \
+        -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/1998/tomtorfs/.gitignore b/1998/tomtorfs/.gitignore
index e0fcdbcec..6c7c8493d 100644
--- a/1998/tomtorfs/.gitignore
+++ b/1998/tomtorfs/.gitignore
@@ -1 +1,3 @@
 tomtorfs
+tomtorfs.orig
+prog.orig
diff --git a/2000/anderson/.gitignore b/2000/anderson/.gitignore
index e9abddf69..59359d658 100644
--- a/2000/anderson/.gitignore
+++ b/2000/anderson/.gitignore
@@ -1,2 +1,4 @@
 anderson
 anderson.alt
+anderson.orig
+prog.orig
diff --git a/2000/anderson/Makefile b/2000/anderson/Makefile
index c66e9d5a1..b63f29178 100644
--- a/2000/anderson/Makefile
+++ b/2000/anderson/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-deprecated-declarations -Wno-implicit-int \
-	-Wno-logical-op-parentheses -Wno-return-type -Wno-unsequenced
+	-Wno-logical-op-parentheses -Wno-return-type -Wno-unsequenced \
+	-Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2000/bellard/.gitignore b/2000/bellard/.gitignore
index 6f007f6fe..d10adb731 100644
--- a/2000/bellard/.gitignore
+++ b/2000/bellard/.gitignore
@@ -1 +1,3 @@
 bellard
+bellard.orig
+prog.orig
diff --git a/2000/bellard/Makefile b/2000/bellard/Makefile
index d5f649bb0..1c07fe9c3 100644
--- a/2000/bellard/Makefile
+++ b/2000/bellard/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-return-type -Wno-unsequenced
+	-Wno-return-type -Wno-unsequenced -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2000/bmeyer/.gitignore b/2000/bmeyer/.gitignore
index b6a5b0192..65631b16b 100644
--- a/2000/bmeyer/.gitignore
+++ b/2000/bmeyer/.gitignore
@@ -1,2 +1,4 @@
 bmeyer
 lavabus.glic
+bmeyer.orig
+prog.orig
diff --git a/2000/bmeyer/Makefile b/2000/bmeyer/Makefile
index 03e32cd6d..623f2fa9f 100644
--- a/2000/bmeyer/Makefile
+++ b/2000/bmeyer/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-format -Wno-parentheses -Wno-string-plus-int
+CSILENCE= -Wno-format -Wno-parentheses -Wno-string-plus-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2000/briddlebane/.gitignore b/2000/briddlebane/.gitignore
index 1b2e83009..edb470ee9 100644
--- a/2000/briddlebane/.gitignore
+++ b/2000/briddlebane/.gitignore
@@ -1 +1,3 @@
 briddlebane
+briddlebane.orig
+prog.orig
diff --git a/2000/briddlebane/Makefile b/2000/briddlebane/Makefile
index bb93c07a2..301fe1567 100644
--- a/2000/briddlebane/Makefile
+++ b/2000/briddlebane/Makefile
@@ -38,8 +38,9 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-absolute-value -Wno-implicit-int \
-	-Wno-incompatible-function-pointer-types -Wno-unsequenced
+CSILENCE= -Wno-absolute-value -Wno-implicit-int -Wno-deprecated-non-prototype \
+	-Wno-incompatible-function-pointer-types -Wno-unsequenced \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2000/dhyang/.gitignore b/2000/dhyang/.gitignore
index 3318988d6..d1bf90d0a 100644
--- a/2000/dhyang/.gitignore
+++ b/2000/dhyang/.gitignore
@@ -6,3 +6,5 @@ soku
 soku.c
 zan
 zan.c
+dhyang.orig
+prog.orig
diff --git a/2000/dhyang/Makefile b/2000/dhyang/Makefile
index 0ae94be5c..561b4d7ff 100644
--- a/2000/dhyang/Makefile
+++ b/2000/dhyang/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
-	-Wno-implicit-int -Wno-main-return-type -Wno-extra-semi
+	-Wno-implicit-int -Wno-main-return-type -Wno-extra-semi \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2000/dlowe/.gitignore b/2000/dlowe/.gitignore
index e0deed35d..54b04a50b 100644
--- a/2000/dlowe/.gitignore
+++ b/2000/dlowe/.gitignore
@@ -1 +1,3 @@
 dlowe
+dlowe.orig
+prog.orig
diff --git a/2000/jarijyrki/.gitignore b/2000/jarijyrki/.gitignore
index 413994b1a..b8281f615 100644
--- a/2000/jarijyrki/.gitignore
+++ b/2000/jarijyrki/.gitignore
@@ -1,3 +1,5 @@
 jarijyrki
 myedits.info
 outfile.info
+jarijyrki.orig
+prog.orig
diff --git a/2000/jarijyrki/Makefile b/2000/jarijyrki/Makefile
index 5744b4ebb..d60bfdb06 100644
--- a/2000/jarijyrki/Makefile
+++ b/2000/jarijyrki/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-empty-body -Wno-error \
-	-Wno-implicit-function-declaration -Wno-implicit-int
+	-Wno-implicit-function-declaration -Wno-implicit-int \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2000/natori/.gitignore b/2000/natori/.gitignore
index 3a5d1f9c4..741f171b6 100644
--- a/2000/natori/.gitignore
+++ b/2000/natori/.gitignore
@@ -1,2 +1,4 @@
 natori
 natori.alt
+natori.orig
+prog.orig
diff --git a/2000/natori/Makefile b/2000/natori/Makefile
index c2709255c..83801de64 100644
--- a/2000/natori/Makefile
+++ b/2000/natori/Makefile
@@ -85,7 +85,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-missing-variable-declarations -Wno-pedantic \
-	-Wno-poison-system-directories
+	-Wno-poison-system-directories -Wno-missing-prototypes
 #
 CWARN+= -Weverything
 #
diff --git a/2000/primenum/.gitignore b/2000/primenum/.gitignore
index 68da89df9..858c9db1a 100644
--- a/2000/primenum/.gitignore
+++ b/2000/primenum/.gitignore
@@ -1 +1,3 @@
 primenum
+primenum.orig
+prog.orig
diff --git a/2000/rince/.gitignore b/2000/rince/.gitignore
index 8ac7f85cd..63efe381e 100644
--- a/2000/rince/.gitignore
+++ b/2000/rince/.gitignore
@@ -1,2 +1,4 @@
 dmy2jd
 rince
+rince.orig
+prog.orig
diff --git a/2000/rince/Makefile b/2000/rince/Makefile
index 2a5ba2763..918459610 100644
--- a/2000/rince/Makefile
+++ b/2000/rince/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
 	-Wno-incompatible-pointer-types -Wno-parentheses -Wno-return-type \
-	-Wno-unevaluated-expression
+	-Wno-unevaluated-expression -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2000/robison/.gitignore b/2000/robison/.gitignore
index c124d1dbc..672ba4f0c 100644
--- a/2000/robison/.gitignore
+++ b/2000/robison/.gitignore
@@ -1 +1,3 @@
 robison
+robison.orig
+prog.orig
diff --git a/2000/robison/Makefile b/2000/robison/Makefile
index 5ac6497f0..a152e1486 100644
--- a/2000/robison/Makefile
+++ b/2000/robison/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
 	-Wno-format-security -Wno-parentheses -Wno-shift-negative-value \
-	-Wno-shift-op-parentheses
+	-Wno-shift-op-parentheses -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2000/schneiderwent/.gitignore b/2000/schneiderwent/.gitignore
index 7add82d84..d91a3e358 100644
--- a/2000/schneiderwent/.gitignore
+++ b/2000/schneiderwent/.gitignore
@@ -1 +1,3 @@
 schneiderwent
+schneiderwent.orig
+prog.orig
diff --git a/2000/schneiderwent/Makefile b/2000/schneiderwent/Makefile
index 02690a80c..477f78a7f 100644
--- a/2000/schneiderwent/Makefile
+++ b/2000/schneiderwent/Makefile
@@ -83,7 +83,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories
+CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories \
+	-Wno-shorten-64-to-32 -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/2000/thadgavin/.gitignore b/2000/thadgavin/.gitignore
index 4b26fde7d..60d3d8955 100644
--- a/2000/thadgavin/.gitignore
+++ b/2000/thadgavin/.gitignore
@@ -2,3 +2,5 @@ thadgavin
 thadgavin_sdl
 thadgavin.alt
 thadgavin.alt_sdl
+thadgavin.orig
+prog.orig
diff --git a/2000/thadgavin/Makefile b/2000/thadgavin/Makefile
index 65e3070c0..3c2b8af1f 100644
--- a/2000/thadgavin/Makefile
+++ b/2000/thadgavin/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body -Wno-implicit-int -Wno-unsequenced
+CSILENCE= -Wno-empty-body -Wno-implicit-int -Wno-unsequenced \
+	-Wno-deprecated-non-prototype -Wno-unused-parameter
 
 # Common C compiler warning flags
 #
diff --git a/2000/tomx/.gitignore b/2000/tomx/.gitignore
index 53d9473c1..6d96ee23d 100644
--- a/2000/tomx/.gitignore
+++ b/2000/tomx/.gitignore
@@ -1,2 +1,4 @@
 tomx
 mkentry
+tomx.orig
+prog.orig
diff --git a/2000/tomx/Makefile b/2000/tomx/Makefile
index 584ea17fd..3187fd7fc 100644
--- a/2000/tomx/Makefile
+++ b/2000/tomx/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-comment
+CSILENCE= -Wno-comment -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2001/anonymous/.gitignore b/2001/anonymous/.gitignore
index a7a430248..1383fb0fd 100644
--- a/2001/anonymous/.gitignore
+++ b/2001/anonymous/.gitignore
@@ -8,3 +8,5 @@ ten.txt
 anonymous.ten.64
 anonymous.bed
 anonymous.bed.64
+anonymous.orig
+prog.orig
diff --git a/2001/anonymous/Makefile b/2001/anonymous/Makefile
index ff74cbde9..4f92f53c2 100644
--- a/2001/anonymous/Makefile
+++ b/2001/anonymous/Makefile
@@ -43,7 +43,8 @@ CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-error \
 	-Wno-int-to-pointer-cast -Wno-macro-redefined -Wno-pedantic \
 	-Wno-pointer-to-int-cast -Wno-return-type -Wno-string-plus-int \
 	-Wno-bitwise-op-parentheses -Wno-format -Wno-format-extra-args \
-	-Wno-int-conversion -Wno-unused-parameter -Wno-unsequenced
+	-Wno-int-conversion -Wno-unused-parameter -Wno-unsequenced \
+	-Wno-deprecated-non-prototype -Wno-unused-value
 
 # Common C compiler warning flags
 #
@@ -91,7 +92,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-bad-function-cast -Wno-comma -Wno-format-nonliteral \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-shadow -Wno-strict-prototypes \
-	-Wno-unused-macros -Wno-shorten-64-to-32
+	-Wno-unused-macros -Wno-shorten-64-to-32 -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/2001/bellard/.gitignore b/2001/bellard/.gitignore
index 52488cedd..f79aeb398 100644
--- a/2001/bellard/.gitignore
+++ b/2001/bellard/.gitignore
@@ -1,3 +1,5 @@
 bellard
 bellard.otccex
 otccelf
+bellard.orig
+prog.orig
diff --git a/2001/bellard/Makefile b/2001/bellard/Makefile
index 533140bfb..c57752f16 100644
--- a/2001/bellard/Makefile
+++ b/2001/bellard/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
 	-Wno-implicit-int -Wno-int-conversion -Wno-int-to-pointer-cast \
-	-Wno-parentheses -Wno-return-type
+	-Wno-parentheses -Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -87,7 +87,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-conditional-uninitialized -Wno-implicit-int-conversion \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-pedantic \
-	-Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-strict-prototypes \
+	-Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/2001/cheong/.gitignore b/2001/cheong/.gitignore
index df4ec6876..0d0e1bdef 100644
--- a/2001/cheong/.gitignore
+++ b/2001/cheong/.gitignore
@@ -1 +1,3 @@
 cheong
+cheong.orig
+prog.orig
diff --git a/2001/cheong/Makefile b/2001/cheong/Makefile
index 346eec27c..7280b74fb 100644
--- a/2001/cheong/Makefile
+++ b/2001/cheong/Makefile
@@ -84,7 +84,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-implicit-int-conversion -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories
+	-Wno-poison-system-directories -Wno-missing-prototypes
 #
 CWARN+= -Weverything
 #
diff --git a/2001/coupard/.gitignore b/2001/coupard/.gitignore
index 7e1830c99..6b6aea6ab 100644
--- a/2001/coupard/.gitignore
+++ b/2001/coupard/.gitignore
@@ -1,2 +1,4 @@
 coupard
 test.wav
+coupard.orig
+prog.orig
diff --git a/2001/coupard/Makefile b/2001/coupard/Makefile
index 40f0c03d5..c54cffb55 100644
--- a/2001/coupard/Makefile
+++ b/2001/coupard/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body -Wno-pointer-sign -Wno-return-type
+CSILENCE= -Wno-empty-body -Wno-pointer-sign -Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2001/ctk/.gitignore b/2001/ctk/.gitignore
index e02fee0dd..e74cd6e9d 100644
--- a/2001/ctk/.gitignore
+++ b/2001/ctk/.gitignore
@@ -1 +1,3 @@
 ctk
+ctk.orig
+prog.orig
diff --git a/2001/dgbeards/.gitignore b/2001/dgbeards/.gitignore
index 4fed522c0..89f71e0ef 100644
--- a/2001/dgbeards/.gitignore
+++ b/2001/dgbeards/.gitignore
@@ -1,2 +1,4 @@
 dgbeards
 dgbeards.alt
+dgbeards.orig
+prog.orig
diff --git a/2001/dgbeards/Makefile b/2001/dgbeards/Makefile
index 80b36b3a8..3dcd3d7e8 100644
--- a/2001/dgbeards/Makefile
+++ b/2001/dgbeards/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
-	-Wno-format-security -Wno-implicit-int -Wno-return-type
+	-Wno-format-security -Wno-implicit-int -Wno-return-type -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -87,7 +87,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-conditional-uninitialized -Wno-format-nonliteral \
 	-Wno-implicit-int-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shadow -Wno-strict-prototypes
+	-Wno-shadow -Wno-strict-prototypes -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2001/herrmann1/.gitignore b/2001/herrmann1/.gitignore
index fced10ad5..867ac8a4d 100644
--- a/2001/herrmann1/.gitignore
+++ b/2001/herrmann1/.gitignore
@@ -2,3 +2,5 @@ herrmann1
 error
 herrmann1-1.c
 herrmann1-3.c
+herrmann1.orig
+prog.orig
diff --git a/2001/herrmann2/.gitignore b/2001/herrmann2/.gitignore
index 1cd73b441..aac4388b1 100644
--- a/2001/herrmann2/.gitignore
+++ b/2001/herrmann2/.gitignore
@@ -1,2 +1,4 @@
 herrmann2
 herrmann2.orig.c
+herrmann2.orig
+prog.orig
diff --git a/2001/herrmann2/Makefile b/2001/herrmann2/Makefile
index 6c147ba33..d5812ea74 100644
--- a/2001/herrmann2/Makefile
+++ b/2001/herrmann2/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-implicit-int -Wno-incompatible-pointer-types -Wno-int-to-pointer-cast \
 	-Wno-parentheses -Wno-shift-op-parentheses -Wno-tautological-compare \
-	-Wno-unused-comparison -Wno-unused-value
+	-Wno-unused-comparison -Wno-unused-value -Wno-int-in-bool-context \
+	-Wno-pointer-bool-conversion -Wno-unsequenced -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -86,7 +87,9 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-extra-semi -Wno-missing-variable-declarations \
-	-Wno-pedantic -Wno-pointer-arith -Wno-poison-system-directories
+	-Wno-pedantic -Wno-pointer-arith -Wno-poison-system-directories \
+	-Wno-implicit-int-conversion -Wno-shorten-64-to-32 -Wno-sign-conversion \
+	-Wno-unreachable-code -Wno-unreachable-code-return
 #
 CWARN+= -Weverything
 #
diff --git a/2001/jason/.gitignore b/2001/jason/.gitignore
index 316a72f9a..54c1cfc1f 100644
--- a/2001/jason/.gitignore
+++ b/2001/jason/.gitignore
@@ -1 +1,3 @@
 jason
+jason.orig
+prog.orig
diff --git a/2001/jason/Makefile b/2001/jason/Makefile
index 9fc3d394b..461d64a48 100644
--- a/2001/jason/Makefile
+++ b/2001/jason/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-extra-semi -Wno-string-plus-int \
-	-Wno-unused-parameter
+	-Wno-unused-parameter -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2001/kev/.gitignore b/2001/kev/.gitignore
index 1fa9f0a7b..97e85fc4c 100644
--- a/2001/kev/.gitignore
+++ b/2001/kev/.gitignore
@@ -1,2 +1,4 @@
 kev
 kev.alt
+kev.orig
+prog.orig
diff --git a/2001/ollinger/.gitignore b/2001/ollinger/.gitignore
index 25cc0f591..47576f34b 100644
--- a/2001/ollinger/.gitignore
+++ b/2001/ollinger/.gitignore
@@ -1 +1,3 @@
 ollinger
+ollinger.orig
+prog.orig
diff --git a/2001/rosten/.gitignore b/2001/rosten/.gitignore
index 568e5b5bb..f7cf44c80 100644
--- a/2001/rosten/.gitignore
+++ b/2001/rosten/.gitignore
@@ -1 +1,3 @@
 rosten
+rosten.orig
+prog.orig
diff --git a/2001/rosten/Makefile b/2001/rosten/Makefile
index 51f66e958..a3610ba92 100644
--- a/2001/rosten/Makefile
+++ b/2001/rosten/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-logical-op-parentheses -Wno-parentheses -Wno-unused-value
+CSILENCE= -Wno-logical-op-parentheses -Wno-parentheses -Wno-unused-value \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2001/schweikh/.gitignore b/2001/schweikh/.gitignore
index 9b1346d05..e2bf902fa 100644
--- a/2001/schweikh/.gitignore
+++ b/2001/schweikh/.gitignore
@@ -1 +1,3 @@
 schweikh
+schweikh.orig
+prog.orig
diff --git a/2001/westley/.gitignore b/2001/westley/.gitignore
index 41c62376a..c20112503 100644
--- a/2001/westley/.gitignore
+++ b/2001/westley/.gitignore
@@ -4,3 +4,5 @@ westley2
 westley2.c
 westley.punch
 westley.sort
+westley.orig
+prog.orig
diff --git a/2001/westley/Makefile b/2001/westley/Makefile
index 05a426a77..d5fff9562 100644
--- a/2001/westley/Makefile
+++ b/2001/westley/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
 	-Wno-implicit-int -Wno-main -Wno-return-type -Wno-trigraphs \
-	-Wno-unused-parameter
+	-Wno-unused-parameter -Wno-incompatible-pointer-types \
+	-Wno-deprecated-declarations -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2001/williams/.gitignore b/2001/williams/.gitignore
index 8a1f55820..853339539 100644
--- a/2001/williams/.gitignore
+++ b/2001/williams/.gitignore
@@ -1 +1,3 @@
 williams
+williams.orig
+prog.orig
diff --git a/2001/williams/Makefile b/2001/williams/Makefile
index b5e4df394..913ee33a0 100644
--- a/2001/williams/Makefile
+++ b/2001/williams/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
 	-Wno-implicit-int -Wno-logical-op-parentheses \
 	-Wno-missing-field-initializers -Wno-return-type -Wno-shift-op-parentheses \
-	-Wno-unsequenced
+	-Wno-unsequenced -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2004/anonymous/.gitignore b/2004/anonymous/.gitignore
index fc917b930..5cc9aa5a2 100644
--- a/2004/anonymous/.gitignore
+++ b/2004/anonymous/.gitignore
@@ -1,2 +1,4 @@
 anonymous
 anonymous.pgm
+anonymous.orig
+prog.orig
diff --git a/2004/arachnid/.gitignore b/2004/arachnid/.gitignore
index acae0fe61..3fb94c2ed 100644
--- a/2004/arachnid/.gitignore
+++ b/2004/arachnid/.gitignore
@@ -1,2 +1,4 @@
 arachnid
 arachnid.alt
+arachnid.orig
+prog.orig
diff --git a/2004/burley/.gitignore b/2004/burley/.gitignore
index 917468cfe..355de6257 100644
--- a/2004/burley/.gitignore
+++ b/2004/burley/.gitignore
@@ -1 +1,3 @@
 burley
+burley.orig
+prog.orig
diff --git a/2004/burley/Makefile b/2004/burley/Makefile
index 1117fd2bb..c1e359ccb 100644
--- a/2004/burley/Makefile
+++ b/2004/burley/Makefile
@@ -85,7 +85,9 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-bad-function-cast -Wno-comma -Wno-missing-variable-declarations \
-	-Wno-shift-sign-overflow -Wno-unknown-warning-option -Wno-poison-system-directories
+	-Wno-shift-sign-overflow -Wno-unknown-warning-option -Wno-poison-system-directories \
+	-Wno-cast-align -Wno-missing-prototypes -Wno-shorten-64-to-32 \
+        -Wno-unreachable-code -Wno-unreachable-code-return
 #
 CWARN+= -Weverything
 #
diff --git a/2004/gavare/.gitignore b/2004/gavare/.gitignore
index d158d2e8d..799811607 100644
--- a/2004/gavare/.gitignore
+++ b/2004/gavare/.gitignore
@@ -1,3 +1,5 @@
 gavare
 ioccc_ray.ppm
 gavare.r3
+gavare.orig
+prog.orig
diff --git a/2004/gavare/Makefile b/2004/gavare/Makefile
index f256bf86e..493f0abf0 100644
--- a/2004/gavare/Makefile
+++ b/2004/gavare/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-return-type
+	-Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2004/gavin/.gitignore b/2004/gavin/.gitignore
index 3107ac4ab..cf34cb6c0 100644
--- a/2004/gavin/.gitignore
+++ b/2004/gavin/.gitignore
@@ -8,3 +8,5 @@ img/README.md
 kernel
 sh
 vi
+gavin.orig
+prog.orig
diff --git a/2004/hibachi/.gitignore b/2004/hibachi/.gitignore
index 49ae8efaf..0530f2f29 100644
--- a/2004/hibachi/.gitignore
+++ b/2004/hibachi/.gitignore
@@ -3,3 +3,5 @@ src/config.log
 src/config.status
 src/hibachi
 src/makefile
+hibachi.orig
+prog.orig
diff --git a/2004/hibachi/Makefile b/2004/hibachi/Makefile
index 53e77e4c4..10f9c6fac 100644
--- a/2004/hibachi/Makefile
+++ b/2004/hibachi/Makefile
@@ -83,7 +83,9 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-format-nonliteral -Wno-implicit-int-conversion -Wno-missing-prototypes \
+        -Wno-missing-variable-declarations -Wno-poison-system-directories \
+        -Wno-shorten-64-to-32 -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/2004/hoyle/.gitignore b/2004/hoyle/.gitignore
index 001070e46..8e990d0ea 100644
--- a/2004/hoyle/.gitignore
+++ b/2004/hoyle/.gitignore
@@ -1,2 +1,4 @@
 hoyle
 hoyle.alt
+hoyle.orig
+prog.orig
diff --git a/2004/hoyle/Makefile b/2004/hoyle/Makefile
index 6caf39713..c88190bef 100644
--- a/2004/hoyle/Makefile
+++ b/2004/hoyle/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-absolute-value -Wno-keyword-macro
+CSILENCE= -Wno-absolute-value -Wno-keyword-macro -Wno-newline-eof
 
 # Common C compiler warning flags
 #
diff --git a/2004/jdalbec/.gitignore b/2004/jdalbec/.gitignore
index 9befa1190..9131cb521 100644
--- a/2004/jdalbec/.gitignore
+++ b/2004/jdalbec/.gitignore
@@ -1,3 +1,5 @@
 jdalbec
 jdalbec2.c
 jdalbec3.c
+jdalbec.orig
+prog.orig
diff --git a/2004/kopczynski/.gitignore b/2004/kopczynski/.gitignore
index 412b0abbc..5851315ba 100644
--- a/2004/kopczynski/.gitignore
+++ b/2004/kopczynski/.gitignore
@@ -1,2 +1,4 @@
 kopczynski
 kopczynski.alt
+kopczynski.orig
+prog.orig
diff --git a/2004/kopczynski/Makefile b/2004/kopczynski/Makefile
index d1166556f..0c443525d 100644
--- a/2004/kopczynski/Makefile
+++ b/2004/kopczynski/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-main -Wno-parentheses
+	-Wno-main -Wno-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2004/newbern/.gitignore b/2004/newbern/.gitignore
index f006a9a2c..e231579e4 100644
--- a/2004/newbern/.gitignore
+++ b/2004/newbern/.gitignore
@@ -1 +1,3 @@
 newbern
+newbern.orig
+prog.orig
diff --git a/2004/newbern/Makefile b/2004/newbern/Makefile
index 894df974b..814ca9309 100644
--- a/2004/newbern/Makefile
+++ b/2004/newbern/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-parentheses -Wno-pointer-sign -Wno-incompatible-pointer-types
+CSILENCE= -Wno-parentheses -Wno-pointer-sign -Wno-incompatible-pointer-types \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2004/omoikane/.gitignore b/2004/omoikane/.gitignore
index db7ab6ec2..ee2c7dd64 100644
--- a/2004/omoikane/.gitignore
+++ b/2004/omoikane/.gitignore
@@ -1 +1,3 @@
 omoikane
+omoikane.orig
+prog.orig
diff --git a/2004/omoikane/Makefile b/2004/omoikane/Makefile
index a6b657747..90c88a637 100644
--- a/2004/omoikane/Makefile
+++ b/2004/omoikane/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body -Wno-int-conversion -Wno-unused-value
+CSILENCE= -Wno-empty-body -Wno-int-conversion -Wno-unused-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2004/schnitzi/.gitignore b/2004/schnitzi/.gitignore
index 563ae8705..8eb45f60f 100644
--- a/2004/schnitzi/.gitignore
+++ b/2004/schnitzi/.gitignore
@@ -1 +1,3 @@
 schnitzi
+schnitzi.orig
+prog.orig
diff --git a/2004/schnitzi/Makefile b/2004/schnitzi/Makefile
index fc007895d..c9117a20b 100644
--- a/2004/schnitzi/Makefile
+++ b/2004/schnitzi/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-deprecated-declarations -Wno-error -Wno-implicit-function-declaration \
-	-Wno-format-extra-args
+	-Wno-format-extra-args -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2004/sds/.gitignore b/2004/sds/.gitignore
index b1057c76f..a36e3f058 100644
--- a/2004/sds/.gitignore
+++ b/2004/sds/.gitignore
@@ -6,3 +6,5 @@ sds2_msg
 sds2_msg.c
 sds_msg
 sds_msg.c
+sds.orig
+prog.orig
diff --git a/2004/sds/Makefile b/2004/sds/Makefile
index 0b74ecbce..93cb0b598 100644
--- a/2004/sds/Makefile
+++ b/2004/sds/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-unsequenced -Wno-unused-value
+CSILENCE= -Wno-unsequenced -Wno-unused-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2004/vik1/.gitignore b/2004/vik1/.gitignore
index 0993548ac..73675e107 100644
--- a/2004/vik1/.gitignore
+++ b/2004/vik1/.gitignore
@@ -1 +1,3 @@
 vik1
+vik1.orig
+prog.orig
diff --git a/2004/vik2/.gitignore b/2004/vik2/.gitignore
index f5be1d630..9e7400974 100644
--- a/2004/vik2/.gitignore
+++ b/2004/vik2/.gitignore
@@ -2,3 +2,5 @@ cat-killing-curiosity
 vik2
 vik2.possible.cat.death_1.c
 vik2.possible.cat.death_2.c
+vik2.orig
+prog.orig
diff --git a/2004/vik2/Makefile b/2004/vik2/Makefile
index 5ebae92e3..dcbedd44b 100644
--- a/2004/vik2/Makefile
+++ b/2004/vik2/Makefile
@@ -83,7 +83,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories
+CSILENCE+= -Wno-poison-system-directories -Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/2005/aidan/.gitignore b/2005/aidan/.gitignore
index 760a4c360..c0bba9c5d 100644
--- a/2005/aidan/.gitignore
+++ b/2005/aidan/.gitignore
@@ -1,2 +1,4 @@
 aidan
 aidan.alt
+aidan.orig
+prog.orig
diff --git a/2005/aidan/Makefile b/2005/aidan/Makefile
index 1198df15a..0cc65bdd4 100644
--- a/2005/aidan/Makefile
+++ b/2005/aidan/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body
+CSILENCE= -Wno-empty-body -Wno-backslash-newline-escape
 
 # Common C compiler warning flags
 #
diff --git a/2005/anon/.gitignore b/2005/anon/.gitignore
index b6307fc00..eb7dd02c1 100644
--- a/2005/anon/.gitignore
+++ b/2005/anon/.gitignore
@@ -1,2 +1,4 @@
 anon
 anon.alt
+anon.orig
+prog.orig
diff --git a/2005/boutines/.gitignore b/2005/boutines/.gitignore
index 6d785e3cb..020c11364 100644
--- a/2005/boutines/.gitignore
+++ b/2005/boutines/.gitignore
@@ -1,3 +1,5 @@
 boutines
 test.svg
 test.png
+boutines.orig
+prog.orig
diff --git a/2005/boutines/Makefile b/2005/boutines/Makefile
index 997c0a295..58abc339d 100644
--- a/2005/boutines/Makefile
+++ b/2005/boutines/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2005/chia/.gitignore b/2005/chia/.gitignore
index 3f188a8fe..9ae6d5e73 100644
--- a/2005/chia/.gitignore
+++ b/2005/chia/.gitignore
@@ -1 +1,3 @@
 chia
+chia.orig
+prog.orig
diff --git a/2005/chia/Makefile b/2005/chia/Makefile
index 21e15ebb4..16b5d5385 100644
--- a/2005/chia/Makefile
+++ b/2005/chia/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-comment -Wno-error -Wno-implicit-function-declaration \
 	-Wno-implicit-int -Wno-keyword-macro -Wno-pedantic -Wno-return-type \
-	-Wno-unused-variable
+	-Wno-unused-variable -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2005/giljade/.gitignore b/2005/giljade/.gitignore
index af14f096f..73f43fe40 100644
--- a/2005/giljade/.gitignore
+++ b/2005/giljade/.gitignore
@@ -2,3 +2,5 @@ giljade
 giljade.alt
 out
 c.c
+giljade.orig
+prog.orig
diff --git a/2005/giljade/Makefile b/2005/giljade/Makefile
index 1dc57c255..29c0fe987 100644
--- a/2005/giljade/Makefile
+++ b/2005/giljade/Makefile
@@ -43,7 +43,7 @@ CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-bitwise-op-parentheses \
 	-Wno-implicit-function-declaration -Wno-extra-semi -Wno-implicit-int \
 	-Wno-logical-op-parentheses -Wno-return-type -Wno-shift-op-parentheses \
 	-Wno-unused-value -Wno-incompatible-pointer-types -Wno-int-conversion \
-	-Wno-parentheses -Wno-misleading-indentation
+	-Wno-parentheses -Wno-misleading-indentation -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -90,7 +90,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-format-nonliteral -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-strict-prototypes -Wno-parentheses -Wno-misleading-indentation
+	-Wno-strict-prototypes -Wno-parentheses -Wno-misleading-indentation \
+	-Wno-shorten-64-to-32
 #
 CWARN+= -Weverything
 #
diff --git a/2005/jetro/.gitignore b/2005/jetro/.gitignore
index 534ad8ed2..7d3f40e7d 100644
--- a/2005/jetro/.gitignore
+++ b/2005/jetro/.gitignore
@@ -1 +1,3 @@
 jetro
+jetro.orig
+prog.orig
diff --git a/2005/klausler/.gitignore b/2005/klausler/.gitignore
index b1c4c9abf..523e95fc4 100644
--- a/2005/klausler/.gitignore
+++ b/2005/klausler/.gitignore
@@ -1,2 +1,4 @@
 dict.h
 klausler
+klausler.orig
+prog.orig
diff --git a/2005/mikeash/.gitignore b/2005/mikeash/.gitignore
index e99792737..0c1a6838d 100644
--- a/2005/mikeash/.gitignore
+++ b/2005/mikeash/.gitignore
@@ -1 +1,3 @@
 mikeash
+mikeash.orig
+prog.orig
diff --git a/2005/mikeash/Makefile b/2005/mikeash/Makefile
index ec10c8c5b..5147990ba 100644
--- a/2005/mikeash/Makefile
+++ b/2005/mikeash/Makefile
@@ -86,7 +86,7 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-format-nonliteral -Wno-implicit-int-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shorten-64-to-32
+	-Wno-shorten-64-to-32 -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2005/mynx/.gitignore b/2005/mynx/.gitignore
index 11a543853..3dfe0da2f 100644
--- a/2005/mynx/.gitignore
+++ b/2005/mynx/.gitignore
@@ -2,3 +2,5 @@ mynx
 mynx.alt
 source/config.*
 source/makefile
+mynx.orig
+prog.orig
diff --git a/2005/persano/.gitignore b/2005/persano/.gitignore
index b950a579f..f507bb94a 100644
--- a/2005/persano/.gitignore
+++ b/2005/persano/.gitignore
@@ -1,2 +1,4 @@
 persano
 foo.gif
+persano.orig
+prog.orig
diff --git a/2005/sykes/.gitignore b/2005/sykes/.gitignore
index 36e58b512..0aae24dc3 100644
--- a/2005/sykes/.gitignore
+++ b/2005/sykes/.gitignore
@@ -1,3 +1,5 @@
 pet.rom
 sykes
 dungeon.prg
+sykes.orig
+prog.orig
diff --git a/2005/sykes/Makefile b/2005/sykes/Makefile
index b2249fc30..8e87b45ed 100644
--- a/2005/sykes/Makefile
+++ b/2005/sykes/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-empty-body -Wno-error \
 	-Wno-implicit-function-declaration -Wno-implicit-int -Wno-parentheses \
-	-Wno-pointer-sign -Wno-return-type
+	-Wno-pointer-sign -Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2005/timwi/.gitignore b/2005/timwi/.gitignore
index cef7896c5..33e1966e3 100644
--- a/2005/timwi/.gitignore
+++ b/2005/timwi/.gitignore
@@ -1 +1,3 @@
 timwi
+timwi.orig
+prog.orig
diff --git a/2005/toledo/.gitignore b/2005/toledo/.gitignore
index 96c3e59ab..dfb8b6ed3 100644
--- a/2005/toledo/.gitignore
+++ b/2005/toledo/.gitignore
@@ -1,3 +1,5 @@
 toledo
 toledo2
 toledo3
+toledo.orig
+prog.orig
diff --git a/2005/vik/.gitignore b/2005/vik/.gitignore
index c28f954b2..a699e986c 100644
--- a/2005/vik/.gitignore
+++ b/2005/vik/.gitignore
@@ -1 +1,3 @@
 vik
+vik.orig
+prog.orig
diff --git a/2005/vince/.gitignore b/2005/vince/.gitignore
index 8cb0b1145..9ed3297f5 100644
--- a/2005/vince/.gitignore
+++ b/2005/vince/.gitignore
@@ -1,2 +1,4 @@
 vince
 vince.alt
+vince.orig
+prog.orig
diff --git a/2005/vince/Makefile b/2005/vince/Makefile
index cedb0c020..e40a274f5 100644
--- a/2005/vince/Makefile
+++ b/2005/vince/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-pointer-sign -Wno-unused-parameter
+CSILENCE= -Wno-pointer-sign -Wno-unused-parameter -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -85,7 +85,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-float-conversion -Wno-implicit-float-conversion \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-padded \
-	-Wno-poison-system-directories -Wno-sign-conversion -Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-sign-conversion -Wno-strict-prototypes \
+	-Wno-shadow -Wno-shorten-64-to-32
 #
 CWARN+= -Weverything
 #
diff --git a/2006/birken/.gitignore b/2006/birken/.gitignore
index e5a552e19..ea1806581 100644
--- a/2006/birken/.gitignore
+++ b/2006/birken/.gitignore
@@ -1 +1,3 @@
 birken
+birken.orig
+prog.orig
diff --git a/2006/birken/Makefile b/2006/birken/Makefile
index be19201fe..c000581a5 100644
--- a/2006/birken/Makefile
+++ b/2006/birken/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-deprecated-declarations
+CSILENCE= -Wno-deprecated-declarations -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2006/borsanyi/.gitignore b/2006/borsanyi/.gitignore
index 3d78a9798..bfa23e129 100644
--- a/2006/borsanyi/.gitignore
+++ b/2006/borsanyi/.gitignore
@@ -1,2 +1,4 @@
 borsanyi
 example.gif
+borsanyi.orig
+prog.orig
diff --git a/2006/grothe/.gitignore b/2006/grothe/.gitignore
index 11e3173dd..d8e4e2a3e 100644
--- a/2006/grothe/.gitignore
+++ b/2006/grothe/.gitignore
@@ -1 +1,3 @@
 grothe
+grothe.orig
+prog.orig
diff --git a/2006/hamre/.gitignore b/2006/hamre/.gitignore
index 7bf9e29be..243895e30 100644
--- a/2006/hamre/.gitignore
+++ b/2006/hamre/.gitignore
@@ -1 +1,3 @@
 hamre
+hamre.orig
+prog.orig
diff --git a/2006/meyer/.gitignore b/2006/meyer/.gitignore
index 6e1b3595d..76ec446fd 100644
--- a/2006/meyer/.gitignore
+++ b/2006/meyer/.gitignore
@@ -1 +1,3 @@
 meyer
+meyer.orig
+prog.orig
diff --git a/2006/meyer/Makefile b/2006/meyer/Makefile
index e0bc0970e..63cee47da 100644
--- a/2006/meyer/Makefile
+++ b/2006/meyer/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-format
+CSILENCE= -Wno-format -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2006/monge/.gitignore b/2006/monge/.gitignore
index 42cc3d02d..34f266b2b 100644
--- a/2006/monge/.gitignore
+++ b/2006/monge/.gitignore
@@ -1 +1,3 @@
 monge
+monge.orig
+prog.orig
diff --git a/2006/monge/Makefile b/2006/monge/Makefile
index 017ca1da7..071c47427 100644
--- a/2006/monge/Makefile
+++ b/2006/monge/Makefile
@@ -42,7 +42,7 @@ CSILENCE= -Wno-bitwise-op-parentheses -Wno-conditional-type-mismatch \
 	-Wno-declaration-after-statement -Wno-dollar-in-identifier-extension \
 	-Wno-error -Wno-implicit-function-declaration \
 	-Wno-incompatible-pointer-types -Wno-int-conversion -Wno-parentheses \
-	-Wno-return-type
+	-Wno-return-type -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -135,7 +135,6 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "This next step may take some time to run:"
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable
diff --git a/2006/night/.gitignore b/2006/night/.gitignore
index 3ba331560..2a6349817 100644
--- a/2006/night/.gitignore
+++ b/2006/night/.gitignore
@@ -1,2 +1,4 @@
 night
 night.alt
+night.orig
+prog.orig
diff --git a/2006/night/Makefile b/2006/night/Makefile
index 06c2549fc..49669fdec 100644
--- a/2006/night/Makefile
+++ b/2006/night/Makefile
@@ -133,7 +133,7 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "This next compile may take a while to complete:"
+	@echo "This next step may take some time to run:"
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable
@@ -142,7 +142,7 @@ alt: data ${ALT_TARGET}
 	@${TRUE}
 
 ${PROG}.alt: ${PROG}.alt.c
-	@echo "This next compile may take a while to complete:"
+	@echo "This next step may take some time to run:"
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # data files
diff --git a/2006/sloane/.gitignore b/2006/sloane/.gitignore
index 8beae2eb9..4ee5cfff9 100644
--- a/2006/sloane/.gitignore
+++ b/2006/sloane/.gitignore
@@ -1,2 +1,4 @@
 sloane
 sloane.alt
+sloane.orig
+prog.orig
diff --git a/2006/sloane/Makefile b/2006/sloane/Makefile
index d4bf0b5b8..14145bf44 100644
--- a/2006/sloane/Makefile
+++ b/2006/sloane/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-pedantic -Wno-return-type -Wno-shift-op-parentheses -Wno-unsequenced
+	-Wno-pedantic -Wno-return-type -Wno-shift-op-parentheses -Wno-unsequenced \
+	-Wno-deprecated-non-prototype -Wno-main
 
 # Common C compiler warning flags
 #
diff --git a/2006/stewart/.gitignore b/2006/stewart/.gitignore
index d5e9679a5..1bca7c738 100644
--- a/2006/stewart/.gitignore
+++ b/2006/stewart/.gitignore
@@ -2,3 +2,5 @@ stewart
 stewart.html
 maze.xbm
 maze.png
+stewart.orig
+prog.orig
diff --git a/2006/sykes1/.gitignore b/2006/sykes1/.gitignore
index 3985f375b..9d0257451 100644
--- a/2006/sykes1/.gitignore
+++ b/2006/sykes1/.gitignore
@@ -1,2 +1,4 @@
 sykes1
 sykes1.html
+sykes1.orig
+prog.orig
diff --git a/2006/sykes2/.gitignore b/2006/sykes2/.gitignore
index 95e0a5398..12c232841 100644
--- a/2006/sykes2/.gitignore
+++ b/2006/sykes2/.gitignore
@@ -1 +1,3 @@
 sykes2
+sykes2.orig
+prog.orig
diff --git a/2006/sykes2/Makefile b/2006/sykes2/Makefile
index 4e023f0e3..50ba6ed1b 100644
--- a/2006/sykes2/Makefile
+++ b/2006/sykes2/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-char-subscripts -Wno-error \
 	-Wno-implicit-function-declaration -Wno-implicit-int -Wno-main \
-	-Wno-pedantic
+	-Wno-pedantic -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2006/toledo1/.gitignore b/2006/toledo1/.gitignore
index 4cf03b026..339de65ac 100644
--- a/2006/toledo1/.gitignore
+++ b/2006/toledo1/.gitignore
@@ -1 +1,3 @@
 toledo1
+toledo1.orig
+prog.orig
diff --git a/2006/toledo1/Makefile b/2006/toledo1/Makefile
index 5ad2159d1..4baac7690 100644
--- a/2006/toledo1/Makefile
+++ b/2006/toledo1/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-empty-body -Wno-error \
 	-Wno-implicit-function-declaration -Wno-implicit-int -Wno-int-conversion \
-	-Wno-pedantic
+	-Wno-pedantic -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2006/toledo2/.gitignore b/2006/toledo2/.gitignore
index a123c7cc0..3579258bf 100644
--- a/2006/toledo2/.gitignore
+++ b/2006/toledo2/.gitignore
@@ -24,3 +24,5 @@ toledo2.alt
 DDT.COM
 *.COM
 *.ASM
+toledo2.orig
+prog.orig
diff --git a/2006/toledo2/Makefile b/2006/toledo2/Makefile
index 9a8b7c048..632ac05ba 100644
--- a/2006/toledo2/Makefile
+++ b/2006/toledo2/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-bitwise-op-parentheses \
 	-Wno-conditional-type-mismatch -Wno-error \
 	-Wno-implicit-function-declaration -Wno-implicit-int -Wno-int-conversion \
-	-Wno-pointer-type-mismatch -Wno-unsequenced
+	-Wno-pointer-type-mismatch -Wno-unsequenced -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2006/toledo3/.gitignore b/2006/toledo3/.gitignore
index d32638e1c..b6ef4194a 100644
--- a/2006/toledo3/.gitignore
+++ b/2006/toledo3/.gitignore
@@ -1,3 +1,5 @@
 toledo3
 toledo3-sbar
 toledo3-txt
+toledo3.orig
+prog.orig
diff --git a/2006/toledo3/Makefile b/2006/toledo3/Makefile
index b331e7835..bcd31dd04 100644
--- a/2006/toledo3/Makefile
+++ b/2006/toledo3/Makefile
@@ -42,7 +42,7 @@ CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-bitwise-op-parentheses \
 	-Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
 	-Wno-incompatible-pointer-types -Wno-int-conversion \
 	-Wno-logical-op-parentheses -Wno-parentheses -Wno-shift-op-parentheses \
-	-Wno-main
+	-Wno-main -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2011/akari/.gitignore b/2011/akari/.gitignore
index 7f7c336a5..bb124a066 100644
--- a/2011/akari/.gitignore
+++ b/2011/akari/.gitignore
@@ -7,3 +7,5 @@ akari4
 akari4.c
 even_output.ppm
 odd_output.ppm
+akari.orig
+prog.orig
diff --git a/2011/akari/Makefile b/2011/akari/Makefile
index 129eaf2db..8cf83aa04 100644
--- a/2011/akari/Makefile
+++ b/2011/akari/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-error -Wno-implicit-function-declaration \
-	-Wno-implicit-int -Wno-return-type -Wno-unused-parameter
+	-Wno-implicit-int -Wno-return-type -Wno-unused-parameter \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2011/blakely/.gitignore b/2011/blakely/.gitignore
index 92abbda70..772efd750 100644
--- a/2011/blakely/.gitignore
+++ b/2011/blakely/.gitignore
@@ -1,2 +1,4 @@
 blakely
 garden.txt
+blakely.orig
+prog.orig
diff --git a/2011/borsanyi/.gitignore b/2011/borsanyi/.gitignore
index 5d7cdea5f..5b920d202 100644
--- a/2011/borsanyi/.gitignore
+++ b/2011/borsanyi/.gitignore
@@ -1 +1,3 @@
 borsanyi
+borsanyi.orig
+prog.orig
diff --git a/2011/borsanyi/Makefile b/2011/borsanyi/Makefile
index 6c25258ce..22a94d719 100644
--- a/2011/borsanyi/Makefile
+++ b/2011/borsanyi/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-error \
 	-Wno-implicit-function-declaration -Wno-format-extra-args \
-	-Wno-implicit-int -Wno-main
+	-Wno-implicit-int -Wno-main -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2011/dlowe/.gitignore b/2011/dlowe/.gitignore
index 1100fb85e..82b96e689 100644
--- a/2011/dlowe/.gitignore
+++ b/2011/dlowe/.gitignore
@@ -1,2 +1,4 @@
 dlowe
 trailed.net
+dlowe.orig
+prog.orig
diff --git a/2011/dlowe/Makefile b/2011/dlowe/Makefile
index 111d603a2..a50d92172 100644
--- a/2011/dlowe/Makefile
+++ b/2011/dlowe/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2011/eastman/.gitignore b/2011/eastman/.gitignore
index a096b10ee..60f59b925 100644
--- a/2011/eastman/.gitignore
+++ b/2011/eastman/.gitignore
@@ -1 +1,3 @@
 eastman
+eastman.orig
+prog.orig
diff --git a/2011/eastman/Makefile b/2011/eastman/Makefile
index 906dd43c5..0c1195af6 100644
--- a/2011/eastman/Makefile
+++ b/2011/eastman/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-implicit-int -Wno-unsequenced
+CSILENCE= -Wno-implicit-int -Wno-unsequenced -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -84,7 +84,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-double-promotion -Wno-implicit-float-conversion \
-	-Wno-poison-system-directories
+	-Wno-poison-system-directories -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2011/fredriksson/.gitignore b/2011/fredriksson/.gitignore
index 2324cdb1f..123e7f821 100644
--- a/2011/fredriksson/.gitignore
+++ b/2011/fredriksson/.gitignore
@@ -1,3 +1,5 @@
 fredriksson
 ag
 ag.c
+fredriksson.orig
+prog.orig
diff --git a/2011/goren/.gitignore b/2011/goren/.gitignore
index ac8e9a9ac..9574cd78a 100644
--- a/2011/goren/.gitignore
+++ b/2011/goren/.gitignore
@@ -1 +1,3 @@
 goren
+goren.orig
+prog.orig
diff --git a/2011/goren/Makefile b/2011/goren/Makefile
index 86dbe4818..ba1480d20 100644
--- a/2011/goren/Makefile
+++ b/2011/goren/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
 	-Wno-implicit-int -Wno-int-conversion -Wno-int-to-pointer-cast \
 	-Wno-pedantic -Wno-pointer-sign -Wno-pointer-to-int-cast -Wno-return-type \
-	-Wno-unused-but-set-parameter -Wno-unused-value
+	-Wno-unused-but-set-parameter -Wno-unused-value -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2011/hamaji/.gitignore b/2011/hamaji/.gitignore
index 38e8b4008..3f800442c 100644
--- a/2011/hamaji/.gitignore
+++ b/2011/hamaji/.gitignore
@@ -1 +1,3 @@
 hamaji
+hamaji.orig
+prog.orig
diff --git a/2011/hamaji/Makefile b/2011/hamaji/Makefile
index 1d84cc24b..c6aab4a26 100644
--- a/2011/hamaji/Makefile
+++ b/2011/hamaji/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-empty-body -Wno-parentheses -Wno-shift-op-parentheses \
-	-Wno-unused-value
+	-Wno-unused-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2011/hou/.gitignore b/2011/hou/.gitignore
index 02f7029f9..1d2c0f26b 100644
--- a/2011/hou/.gitignore
+++ b/2011/hou/.gitignore
@@ -1 +1,3 @@
 hou
+hou.orig
+prog.orig
diff --git a/2011/konno/.gitignore b/2011/konno/.gitignore
index 1f308a241..a0e566dd0 100644
--- a/2011/konno/.gitignore
+++ b/2011/konno/.gitignore
@@ -1 +1,3 @@
 konno
+konno.orig
+prog.orig
diff --git a/2011/konno/Makefile b/2011/konno/Makefile
index f984d8d2b..fbd431643 100644
--- a/2011/konno/Makefile
+++ b/2011/konno/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-error \
 	-Wno-implicit-function-declaration -Wno-implicit-int -Wno-parentheses \
-	-Wno-pedantic -Wno-unsequenced
+	-Wno-pedantic -Wno-unsequenced -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2011/richards/.gitignore b/2011/richards/.gitignore
index 94c1e89c1..c13e760fd 100644
--- a/2011/richards/.gitignore
+++ b/2011/richards/.gitignore
@@ -1 +1,3 @@
 richards
+richards.orig
+prog.orig
diff --git a/2011/richards/Makefile b/2011/richards/Makefile
index 3b5f81a82..571108da7 100644
--- a/2011/richards/Makefile
+++ b/2011/richards/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses \
+	-Wno-incompatible-pointer-types
 
 # Common C compiler warning flags
 #
@@ -86,7 +87,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-cast-align -Wno-missing-prototypes -Wno-missing-variable-declarations \
 	-Wno-pedantic -Wno-poison-system-directories -Wno-shadow \
 	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-strict-prototypes \
-	-Wno-undef
+	-Wno-undef -Wno-alloca
 #
 CWARN+= -Weverything
 #
diff --git a/2011/toledo/.gitignore b/2011/toledo/.gitignore
index 7e255de0f..a90cde0ba 100644
--- a/2011/toledo/.gitignore
+++ b/2011/toledo/.gitignore
@@ -1 +1,3 @@
 toledo
+toledo.orig
+prog.orig
diff --git a/2011/toledo/Makefile b/2011/toledo/Makefile
index 5a928dd85..035656147 100644
--- a/2011/toledo/Makefile
+++ b/2011/toledo/Makefile
@@ -41,7 +41,8 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-empty-body -Wno-error \
 	-Wno-implicit-function-declaration -Wno-implicit-int \
 	-Wno-incompatible-pointer-types -Wno-int-conversion -Wno-parentheses \
-	-Wno-return-type -Wno-shift-op-parentheses -Wno-unsequenced
+	-Wno-return-type -Wno-shift-op-parentheses -Wno-unsequenced \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2011/vik/.gitignore b/2011/vik/.gitignore
index 2b2875d14..b00f85d15 100644
--- a/2011/vik/.gitignore
+++ b/2011/vik/.gitignore
@@ -1,3 +1,5 @@
 vik
 audio_file.raw
 vik.alt
+vik.orig
+prog.orig
diff --git a/2011/zucker/.gitignore b/2011/zucker/.gitignore
index 3c482aec0..b11ce3dcc 100644
--- a/2011/zucker/.gitignore
+++ b/2011/zucker/.gitignore
@@ -2,3 +2,5 @@ image.ppm
 hello.ppm
 image2.ppm
 zucker
+zucker.orig
+prog.orig
diff --git a/2011/zucker/Makefile b/2011/zucker/Makefile
index 3e78fa183..2312f4051 100644
--- a/2011/zucker/Makefile
+++ b/2011/zucker/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body
+CSILENCE= -Wno-empty-body -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2012/blakely/.gitignore b/2012/blakely/.gitignore
index 4931758f0..b3ac8b413 100644
--- a/2012/blakely/.gitignore
+++ b/2012/blakely/.gitignore
@@ -6,3 +6,5 @@ flat.gif
 pic.gif
 ripple.gif
 saddle.gif
+blakely.orig
+prog.orig
diff --git a/2012/blakely/Makefile b/2012/blakely/Makefile
index 86179fc10..f13dbf3cd 100644
--- a/2012/blakely/Makefile
+++ b/2012/blakely/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unused-parameter
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unused-parameter \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2012/deckmyn/.gitignore b/2012/deckmyn/.gitignore
index 2e28a65dc..b51f80632 100644
--- a/2012/deckmyn/.gitignore
+++ b/2012/deckmyn/.gitignore
@@ -5,3 +5,5 @@ sheetmusic.pbm
 sheetmusic.pbm
 sheetmusic.pbm
 output.pbm
+deckmyn.orig
+prog.orig
diff --git a/2012/deckmyn/Makefile b/2012/deckmyn/Makefile
index ecea14aec..3b4bcf2cf 100644
--- a/2012/deckmyn/Makefile
+++ b/2012/deckmyn/Makefile
@@ -85,7 +85,8 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-cast-align -Wno-comma -Wno-implicit-int-conversion \
-	-Wno-poison-system-directorie
+	-Wno-poison-system-directorie -Wno-unknown-warning-option \
+	-Wno-poison-system-directories
 #
 CWARN+= -Weverything
 #
diff --git a/2012/dlowe/.gitignore b/2012/dlowe/.gitignore
index e0deed35d..54b04a50b 100644
--- a/2012/dlowe/.gitignore
+++ b/2012/dlowe/.gitignore
@@ -1 +1,3 @@
 dlowe
+dlowe.orig
+prog.orig
diff --git a/2012/dlowe/Makefile b/2012/dlowe/Makefile
index 78530159e..a289fc2f0 100644
--- a/2012/dlowe/Makefile
+++ b/2012/dlowe/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-dangling-else
+CSILENCE= -Wno-dangling-else -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2012/endoh1/.gitignore b/2012/endoh1/.gitignore
index bae478e61..6c2f07223 100644
--- a/2012/endoh1/.gitignore
+++ b/2012/endoh1/.gitignore
@@ -2,3 +2,5 @@ endoh1
 endoh1.alt
 endoh1_color
 configuration.txt
+endoh1.orig
+prog.orig
diff --git a/2012/endoh1/Makefile b/2012/endoh1/Makefile
index 5ab733a1f..ca4a9fd97 100644
--- a/2012/endoh1/Makefile
+++ b/2012/endoh1/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-absolute-value
+CSILENCE= -Wno-absolute-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2012/endoh2/.gitignore b/2012/endoh2/.gitignore
index f1ba1ed50..6d4ca8a82 100644
--- a/2012/endoh2/.gitignore
+++ b/2012/endoh2/.gitignore
@@ -39,3 +39,5 @@ e.c
 endoh2
 pi
 pi.c
+endoh2.orig
+prog.orig
diff --git a/2012/endoh2/Makefile b/2012/endoh2/Makefile
index 67a56cc68..636351c86 100644
--- a/2012/endoh2/Makefile
+++ b/2012/endoh2/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-parentheses -Wno-empty-body
+CSILENCE= -Wno-parentheses -Wno-empty-body -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -84,7 +84,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-format-nonliteral -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories
+	-Wno-poison-system-directories -Wno-float-conversion -Wno-implicit-int-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/2012/grothe/.gitignore b/2012/grothe/.gitignore
index 55e10c3b7..66c9ff95b 100644
--- a/2012/grothe/.gitignore
+++ b/2012/grothe/.gitignore
@@ -1,3 +1,5 @@
 grothe
 grothe.c.1
 grothe.c.2
+grothe.orig
+prog.orig
diff --git a/2012/hamano/.gitignore b/2012/hamano/.gitignore
index 4bc0c7d1b..0b1b01e77 100644
--- a/2012/hamano/.gitignore
+++ b/2012/hamano/.gitignore
@@ -5,3 +5,5 @@ hello.pdf
 hello2
 hello3
 output.pdf
+hamano.orig
+prog.orig
diff --git a/2012/hou/.gitignore b/2012/hou/.gitignore
index b839123df..bb3ff807f 100644
--- a/2012/hou/.gitignore
+++ b/2012/hou/.gitignore
@@ -2,3 +2,5 @@ hou
 hou.html
 remarks.htm
 remarks.htm
+hou.orig
+prog.orig
diff --git a/2012/hou/Makefile b/2012/hou/Makefile
index e2861842a..94d3bcc74 100644
--- a/2012/hou/Makefile
+++ b/2012/hou/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-format-extra-args \
 	-Wno-implicit-int -Wno-missing-field-initializers \
 	-Wno-non-literal-null-conversion -Wno-return-type -Wno-shift-op-parentheses \
-	-Wno-unused-parameter
+	-Wno-unused-parameter -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2012/kang/.gitignore b/2012/kang/.gitignore
index 0ac0f0f49..7331c5357 100644
--- a/2012/kang/.gitignore
+++ b/2012/kang/.gitignore
@@ -1 +1,3 @@
 kang
+kang.orig
+prog.orig
diff --git a/2012/kang/Makefile b/2012/kang/Makefile
index 8a410fdc2..0453afa04 100644
--- a/2012/kang/Makefile
+++ b/2012/kang/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-error -Wno-implicit-function-declaration \
-	-Wno-implicit-int -Wno-int-conversion -Wno-pointer-to-int-cast
+	-Wno-implicit-int -Wno-int-conversion -Wno-pointer-to-int-cast \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2012/konno/.gitignore b/2012/konno/.gitignore
index c475a0544..4a1ad3a85 100644
--- a/2012/konno/.gitignore
+++ b/2012/konno/.gitignore
@@ -1,2 +1,4 @@
 konno
 konno.alt
+konno.orig
+prog.orig
diff --git a/2012/konno/Makefile b/2012/konno/Makefile
index 88cdba81d..9d4722876 100644
--- a/2012/konno/Makefile
+++ b/2012/konno/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-bitwise-op-parentheses \
 	-Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
 	-Wno-int-conversion -Wno-parentheses -Wno-pointer-to-int-cast \
-	-Wno-shift-op-parentheses
+	-Wno-shift-op-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2012/omoikane/.gitignore b/2012/omoikane/.gitignore
index 38289f738..c08432e3a 100644
--- a/2012/omoikane/.gitignore
+++ b/2012/omoikane/.gitignore
@@ -6,3 +6,5 @@ nyaruko
 output
 output.c
 regenerated.bin
+omoikane.orig
+prog.orig
diff --git a/2012/omoikane/Makefile b/2012/omoikane/Makefile
index 5c25ced69..4904b1e12 100644
--- a/2012/omoikane/Makefile
+++ b/2012/omoikane/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body
+CSILENCE= -Wno-empty-body -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2012/tromp/.gitignore b/2012/tromp/.gitignore
index 7666c55b6..0011eedb1 100644
--- a/2012/tromp/.gitignore
+++ b/2012/tromp/.gitignore
@@ -1,3 +1,5 @@
 tromp
 tromp32
 tromp64
+tromp.orig
+prog.orig
diff --git a/2012/tromp/Makefile b/2012/tromp/Makefile
index 410cfcbf0..778d4f56a 100644
--- a/2012/tromp/Makefile
+++ b/2012/tromp/Makefile
@@ -40,7 +40,8 @@ include ../../var.mk
 #
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-conditional-type-mismatch -Wno-error \
 	-Wno-implicit-function-declaration -Wno-incompatible-pointer-types \
-	-Wno-int-conversion -Wno-main -Wno-return-type -Wno-unused-parameter
+	-Wno-int-conversion -Wno-main -Wno-return-type -Wno-unused-parameter \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2012/vik/.gitignore b/2012/vik/.gitignore
index 4e1643ecb..ab94f510a 100644
--- a/2012/vik/.gitignore
+++ b/2012/vik/.gitignore
@@ -6,3 +6,5 @@ restored-ioccc.png
 restored.png
 vik
 vik.alt
+vik.orig
+prog.orig
diff --git a/2012/zeitak/.gitignore b/2012/zeitak/.gitignore
index 0307545a3..a491adef1 100644
--- a/2012/zeitak/.gitignore
+++ b/2012/zeitak/.gitignore
@@ -1,2 +1,4 @@
 zeitak
 zeitak.alt
+zeitak.orig
+prog.orig
diff --git a/2013/birken/.gitignore b/2013/birken/.gitignore
index 88dd6a63b..68a90f3c4 100644
--- a/2013/birken/.gitignore
+++ b/2013/birken/.gitignore
@@ -1,2 +1,4 @@
 birken
 birken.alt
+birken.orig
+prog.orig
diff --git a/2013/birken/Makefile b/2013/birken/Makefile
index 976736cc7..d05baf43c 100644
--- a/2013/birken/Makefile
+++ b/2013/birken/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-newline-eof
+CSILENCE= -Wno-newline-eof -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2013/cable1/.gitignore b/2013/cable1/.gitignore
index 91e453045..26d8499e2 100644
--- a/2013/cable1/.gitignore
+++ b/2013/cable1/.gitignore
@@ -1 +1,3 @@
 cable1
+cable1.orig
+prog.orig
diff --git a/2013/cable2/.gitignore b/2013/cable2/.gitignore
index bb21f2489..aa50a69a0 100644
--- a/2013/cable2/.gitignore
+++ b/2013/cable2/.gitignore
@@ -1 +1,3 @@
 cable2
+cable2.orig
+prog.orig
diff --git a/2013/cable3/.gitignore b/2013/cable3/.gitignore
index 669871cfd..ee6fe2bcb 100644
--- a/2013/cable3/.gitignore
+++ b/2013/cable3/.gitignore
@@ -1 +1,3 @@
 cable3
+cable3.orig
+prog.orig
diff --git a/2013/cable3/Makefile b/2013/cable3/Makefile
index 5ce30ea45..d4f730798 100644
--- a/2013/cable3/Makefile
+++ b/2013/cable3/Makefile
@@ -43,7 +43,8 @@ CSILENCE= -Wno-bitwise-op-parentheses -Wno-bool-operation \
 	-Wno-implicit-function-declaration -Wno-implicit-int \
 	-Wno-incompatible-pointer-types -Wno-logical-not-parentheses \
 	-Wno-logical-op-parentheses -Wno-parentheses -Wno-shift-op-parentheses \
-	-Wno-sign-compare -Wno-unsequenced -Wno-unused-parameter
+	-Wno-sign-compare -Wno-unsequenced -Wno-unused-parameter \
+	-Wno-deprecated-non-prototype -Wno-return-type
 
 # Common C compiler warning flags
 #
diff --git a/2013/dlowe/.gitignore b/2013/dlowe/.gitignore
index e0deed35d..54b04a50b 100644
--- a/2013/dlowe/.gitignore
+++ b/2013/dlowe/.gitignore
@@ -1 +1,3 @@
 dlowe
+dlowe.orig
+prog.orig
diff --git a/2013/dlowe/Makefile b/2013/dlowe/Makefile
index 291fe3368..96a28e8ab 100644
--- a/2013/dlowe/Makefile
+++ b/2013/dlowe/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-implicit-int -Wno-pedantic
+CSILENCE= -Wno-implicit-int -Wno-pedantic -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2013/endoh1/.gitignore b/2013/endoh1/.gitignore
index 6e5ac6929..0f7fc3d2a 100644
--- a/2013/endoh1/.gitignore
+++ b/2013/endoh1/.gitignore
@@ -2,3 +2,5 @@ echo
 endoh1
 hello
 tac
+endoh1.orig
+prog.orig
diff --git a/2013/endoh1/Makefile b/2013/endoh1/Makefile
index f3d2631bb..91ba9980e 100644
--- a/2013/endoh1/Makefile
+++ b/2013/endoh1/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2013/endoh2/.gitignore b/2013/endoh2/.gitignore
index 9aed40587..6f9f7823d 100644
--- a/2013/endoh2/.gitignore
+++ b/2013/endoh2/.gitignore
@@ -2,3 +2,5 @@ endoh2
 jpeg
 jpeg.c
 jpeg.jpg
+endoh2.orig
+prog.orig
diff --git a/2013/endoh2/Makefile b/2013/endoh2/Makefile
index c1efe3734..da80cf4be 100644
--- a/2013/endoh2/Makefile
+++ b/2013/endoh2/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -85,7 +85,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-float-conversion -Wno-implicit-int-conversion \
 	-Wno-missing-prototypes -Wno-missing-variae-declarations \
-	-Wno-poison-system-directories -Wno-shadow
+	-Wno-poison-system-directories -Wno-shadow -Wno-missing-variable-declarations \
+	-Wno-unknown-warning-option
 #
 CWARN+= -Weverything
 #
diff --git a/2013/endoh3/.gitignore b/2013/endoh3/.gitignore
index 63da6681f..39171d777 100644
--- a/2013/endoh3/.gitignore
+++ b/2013/endoh3/.gitignore
@@ -1 +1,3 @@
 endoh3
+endoh3.orig
+prog.orig
diff --git a/2013/endoh3/Makefile b/2013/endoh3/Makefile
index bb6a6a09d..0a7d73125 100644
--- a/2013/endoh3/Makefile
+++ b/2013/endoh3/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-main
+	-Wno-main -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2013/endoh4/.gitignore b/2013/endoh4/.gitignore
index 19b8fc2ec..4bbf9d2ec 100644
--- a/2013/endoh4/.gitignore
+++ b/2013/endoh4/.gitignore
@@ -1 +1,3 @@
 endoh4
+endoh4.orig
+prog.orig
diff --git a/2013/hou/.gitignore b/2013/hou/.gitignore
index 25a091b18..b802b96e6 100644
--- a/2013/hou/.gitignore
+++ b/2013/hou/.gitignore
@@ -1,3 +1,5 @@
 a
 a.c
 hou
+hou.orig
+prog.orig
diff --git a/2013/hou/Makefile b/2013/hou/Makefile
index f89818f88..435e24c83 100644
--- a/2013/hou/Makefile
+++ b/2013/hou/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-sign-compare
+CSILENCE= -Wno-sign-compare -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2013/mills/.gitignore b/2013/mills/.gitignore
index 435314278..4108396dd 100644
--- a/2013/mills/.gitignore
+++ b/2013/mills/.gitignore
@@ -1 +1,3 @@
 mills
+mills.orig
+prog.orig
diff --git a/2013/mills/Makefile b/2013/mills/Makefile
index 2dce9abcb..9b287ef08 100644
--- a/2013/mills/Makefile
+++ b/2013/mills/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-bitwise-op-parentheses -Wno-parentheses
+CSILENCE= -Wno-bitwise-op-parentheses -Wno-parentheses -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2013/misaka/.gitignore b/2013/misaka/.gitignore
index 48055accb..5bf58f7fb 100644
--- a/2013/misaka/.gitignore
+++ b/2013/misaka/.gitignore
@@ -16,3 +16,5 @@ misaka8.c
 misaka9.c
 same_as_long_cat
 vertical_cat
+misaka.orig
+prog.orig
diff --git a/2013/misaka/Makefile b/2013/misaka/Makefile
index b4a0554d6..b17f90426 100644
--- a/2013/misaka/Makefile
+++ b/2013/misaka/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-comment -Wno-empty-body
+CSILENCE= -Wno-comment -Wno-empty-body -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2013/morgan1/.gitignore b/2013/morgan1/.gitignore
index 730491f82..4577b8582 100644
--- a/2013/morgan1/.gitignore
+++ b/2013/morgan1/.gitignore
@@ -1 +1,3 @@
 morgan1
+morgan1.orig
+prog.orig
diff --git a/2013/morgan1/Makefile b/2013/morgan1/Makefile
index 07364fe30..328545d16 100644
--- a/2013/morgan1/Makefile
+++ b/2013/morgan1/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-absolute-value -Wno-logical-op-parentheses -Wno-shift-op-parentheses
+CSILENCE= -Wno-absolute-value -Wno-logical-op-parentheses -Wno-shift-op-parentheses \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2013/morgan2/.gitignore b/2013/morgan2/.gitignore
index 28e6e30d6..9b27a6331 100644
--- a/2013/morgan2/.gitignore
+++ b/2013/morgan2/.gitignore
@@ -1 +1,3 @@
 morgan2
+morgan2.orig
+prog.orig
diff --git a/2013/morgan2/Makefile b/2013/morgan2/Makefile
index f4b4ef29e..687e8768d 100644
--- a/2013/morgan2/Makefile
+++ b/2013/morgan2/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-string-plus-int
+CSILENCE= -Wno-string-plus-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2013/robison/.gitignore b/2013/robison/.gitignore
index c124d1dbc..672ba4f0c 100644
--- a/2013/robison/.gitignore
+++ b/2013/robison/.gitignore
@@ -1 +1,3 @@
 robison
+robison.orig
+prog.orig
diff --git a/2014/birken/.gitignore b/2014/birken/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2014/birken/.gitignore
+++ b/2014/birken/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2014/deak/.gitignore b/2014/deak/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2014/deak/.gitignore
+++ b/2014/deak/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2014/deak/Makefile b/2014/deak/Makefile
index 3b51b5947..fea411c41 100644
--- a/2014/deak/Makefile
+++ b/2014/deak/Makefile
@@ -85,7 +85,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-float-equal -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories
+	-Wno-poison-system-directories -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2014/endoh1/.gitignore b/2014/endoh1/.gitignore
index 7ba4a572a..2d72bda99 100644
--- a/2014/endoh1/.gitignore
+++ b/2014/endoh1/.gitignore
@@ -3,3 +3,4 @@ main.c
 prog
 treacle
 treacle.c
+prog.orig
diff --git a/2014/endoh1/Makefile b/2014/endoh1/Makefile
index 96ff15351..67e1f7431 100644
--- a/2014/endoh1/Makefile
+++ b/2014/endoh1/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body
+CSILENCE= -Wno-empty-body -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2014/endoh2/.gitignore b/2014/endoh2/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2014/endoh2/.gitignore
+++ b/2014/endoh2/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2014/maffiodo1/.gitignore b/2014/maffiodo1/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2014/maffiodo1/.gitignore
+++ b/2014/maffiodo1/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2014/maffiodo1/Makefile b/2014/maffiodo1/Makefile
index 8e0ff3641..2d98c27db 100644
--- a/2014/maffiodo1/Makefile
+++ b/2014/maffiodo1/Makefile
@@ -41,7 +41,8 @@ include ../../var.mk
 CSILENCE= -Wno-error -Wno-implicit-function-declaration \
 	-Wno-incompatible-function-pointer-types -Wno-incompatible-pointer-types \
 	-Wno-int-conversion -Wno-missing-field-initializers -Wno-parentheses \
-	-Wno-pointer-sign -Wno-return-type -Wno-unused-parameter -Wno-implicit-int
+	-Wno-pointer-sign -Wno-return-type -Wno-unused-parameter -Wno-implicit-int \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -89,7 +90,8 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-documentation -Wno-extra-semi -Wno-implicit-int \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-padded \
 	-Wno-pedantic -Wno-poison-system-directories -Wno-shadow \
-	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-strict-prototypes
+	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-strict-prototypes \
+	-Wno-declaration-after-statement -Wno-implicit-int-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/2014/maffiodo2/.gitignore b/2014/maffiodo2/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2014/maffiodo2/.gitignore
+++ b/2014/maffiodo2/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2014/maffiodo2/Makefile b/2014/maffiodo2/Makefile
index dfc082510..47b5f3adb 100644
--- a/2014/maffiodo2/Makefile
+++ b/2014/maffiodo2/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-return-type -Wno-unused-parameter
+	-Wno-return-type -Wno-unused-parameter -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2014/morgan/.gitignore b/2014/morgan/.gitignore
index 959c815ac..69ff0c3c2 100644
--- a/2014/morgan/.gitignore
+++ b/2014/morgan/.gitignore
@@ -1,2 +1,3 @@
 prog
 morgan
+prog.orig
diff --git a/2014/morgan/Makefile b/2014/morgan/Makefile
index 3f9914fc9..80b09f7ef 100644
--- a/2014/morgan/Makefile
+++ b/2014/morgan/Makefile
@@ -84,7 +84,8 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-missing-prototypes -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-sign-conversion
+	-Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-sign-conversion \
+	-Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2014/sinon/.gitignore b/2014/sinon/.gitignore
index 91cfa07d3..3fb452ef6 100644
--- a/2014/sinon/.gitignore
+++ b/2014/sinon/.gitignore
@@ -1,2 +1,3 @@
 prog
 sinon.c
+prog.orig
diff --git a/2014/sinon/Makefile b/2014/sinon/Makefile
index 3123b9003..5877cfe77 100644
--- a/2014/sinon/Makefile
+++ b/2014/sinon/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-pointer-arith
+CSILENCE= -Wno-pointer-arith -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2014/skeggs/.gitignore b/2014/skeggs/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2014/skeggs/.gitignore
+++ b/2014/skeggs/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2014/skeggs/Makefile b/2014/skeggs/Makefile
index 8f5237b1f..920410a8e 100644
--- a/2014/skeggs/Makefile
+++ b/2014/skeggs/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-format-extra-args -Wno-keyword-macro -Wno-parentheses \
-	-Wno-unused-parameter
+	-Wno-unused-parameter -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -87,7 +87,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-class-varargs -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
 	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-strict-prototypes \
-	-Wno-unused-macros
+	-Wno-unused-macros -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2014/vik/.gitignore b/2014/vik/.gitignore
index 1819b044b..e36a12dc8 100644
--- a/2014/vik/.gitignore
+++ b/2014/vik/.gitignore
@@ -1,3 +1,4 @@
 audio_file.raw
 prog
 prog.raw
+prog.orig
diff --git a/2014/wiedijk/.gitignore b/2014/wiedijk/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2014/wiedijk/.gitignore
+++ b/2014/wiedijk/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2014/wiedijk/Makefile b/2014/wiedijk/Makefile
index 1af9dddc7..df82ceb55 100644
--- a/2014/wiedijk/Makefile
+++ b/2014/wiedijk/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/burton/.gitignore b/2015/burton/.gitignore
index ffb16e793..160504d00 100644
--- a/2015/burton/.gitignore
+++ b/2015/burton/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2015/burton/Makefile b/2015/burton/Makefile
index 8e21c61ce..0bffc6496 100644
--- a/2015/burton/Makefile
+++ b/2015/burton/Makefile
@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-empty-body -Wno-long-long -Wno-parentheses \
-	-Wno-return-type -Wno-unsequenced -Wno-unused-parameter
+	-Wno-return-type -Wno-unsequenced -Wno-unused-parameter \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/dogon/.gitignore b/2015/dogon/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2015/dogon/.gitignore
+++ b/2015/dogon/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2015/dogon/Makefile b/2015/dogon/Makefile
index a2b2ac0bb..0571afcf7 100644
--- a/2015/dogon/Makefile
+++ b/2015/dogon/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-absolute-value -Wno-char-subscripts -Wno-dangling-else -Wno-error \
 	-Wno-implicit-function-declaration -Wno-parentheses \
-	-Wno-shift-op-parentheses -Wno-implicit-int
+	-Wno-shift-op-parentheses -Wno-implicit-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -88,7 +88,7 @@ ifeq ($(CC),clang)
 
 CSILENCE+= -Wno-double-promotion -Wno-float-conversion -Wno-implicit-float-conversion \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shadow -Wno-shorten-64-to-32 -Wno-sign-conversion
+	-Wno-shadow -Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2015/duble/.gitignore b/2015/duble/.gitignore
index ffb16e793..160504d00 100644
--- a/2015/duble/.gitignore
+++ b/2015/duble/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2015/duble/Makefile b/2015/duble/Makefile
index b486388c4..1e57117d3 100644
--- a/2015/duble/Makefile
+++ b/2015/duble/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-op-parentheses -Wno-implicit-int -Wno-int-conversion \
 	    -Wno-logical-op-parentheses -Wno-overlength-strings -Wno-return-type \
 	    -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-unsequenced \
-	    -Wno-unused-value
+	    -Wno-unused-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/endoh1/.gitignore b/2015/endoh1/.gitignore
index 62cfdd752..a792f966f 100644
--- a/2015/endoh1/.gitignore
+++ b/2015/endoh1/.gitignore
@@ -7,3 +7,4 @@ gray-scott-3
 gray-scott-4
 oregonator
 prog
+prog.orig
diff --git a/2015/endoh1/Makefile b/2015/endoh1/Makefile
index 44c849b06..f78697a0e 100644
--- a/2015/endoh1/Makefile
+++ b/2015/endoh1/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/endoh2/.gitignore b/2015/endoh2/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2015/endoh2/.gitignore
+++ b/2015/endoh2/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2015/endoh2/Makefile b/2015/endoh2/Makefile
index 9ac9ab267..cb067a6c3 100644
--- a/2015/endoh2/Makefile
+++ b/2015/endoh2/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration
+CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/endoh3/.gitignore b/2015/endoh3/.gitignore
index ccc7d5d68..485608bc9 100644
--- a/2015/endoh3/.gitignore
+++ b/2015/endoh3/.gitignore
@@ -3,3 +3,4 @@ ioccc
 koch
 pi
 quine
+prog.orig
diff --git a/2015/endoh3/Makefile b/2015/endoh3/Makefile
index 2f478f2f6..e101d80c9 100644
--- a/2015/endoh3/Makefile
+++ b/2015/endoh3/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-main
+CSILENCE= -Wno-main -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/endoh4/.gitignore b/2015/endoh4/.gitignore
index ffb16e793..160504d00 100644
--- a/2015/endoh4/.gitignore
+++ b/2015/endoh4/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2015/endoh4/Makefile b/2015/endoh4/Makefile
index bada2bc73..5334bfc0a 100644
--- a/2015/endoh4/Makefile
+++ b/2015/endoh4/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-main -Wno-pedantic -Wno-return-type
+	-Wno-main -Wno-pedantic -Wno-return-type -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2015/hou/.gitignore b/2015/hou/.gitignore
index 9934da7fc..746b4ae4b 100644
--- a/2015/hou/.gitignore
+++ b/2015/hou/.gitignore
@@ -1,2 +1,3 @@
 prebuild
 prog
+prog.orig
diff --git a/2015/hou/Makefile b/2015/hou/Makefile
index 86e7afbab..abf259f6e 100644
--- a/2015/hou/Makefile
+++ b/2015/hou/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/howe/.gitignore b/2015/howe/.gitignore
index 02f6f69b6..b2f5a1598 100644
--- a/2015/howe/.gitignore
+++ b/2015/howe/.gitignore
@@ -22,3 +22,4 @@ CBABAC.tmp
 EMPTY.tmp
 patch.tmp
 ABD.tmp
+prog.orig
diff --git a/2015/howe/Makefile b/2015/howe/Makefile
index 8bbed53ba..dfa1bbb92 100644
--- a/2015/howe/Makefile
+++ b/2015/howe/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-sign-compare
+CSILENCE= -Wno-sign-compare -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/mills1/.gitignore b/2015/mills1/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2015/mills1/.gitignore
+++ b/2015/mills1/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2015/mills1/Makefile b/2015/mills1/Makefile
index 88f38bff2..1a9d5e0e6 100644
--- a/2015/mills1/Makefile
+++ b/2015/mills1/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-parentheses \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/mills2/.gitignore b/2015/mills2/.gitignore
index fb7f18f79..a677a824d 100644
--- a/2015/mills2/.gitignore
+++ b/2015/mills2/.gitignore
@@ -4,3 +4,4 @@ test1
 test1.Z 
 test2 
 test2.Z
+prog.orig
diff --git a/2015/muth/.gitignore b/2015/muth/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2015/muth/.gitignore
+++ b/2015/muth/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2015/muth/Makefile b/2015/muth/Makefile
index 1ee9f9459..6c7d8bd4b 100644
--- a/2015/muth/Makefile
+++ b/2015/muth/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-keyword-macro
+CSILENCE= -Wno-keyword-macro -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2015/schweikhardt/.gitignore b/2015/schweikhardt/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2015/schweikhardt/.gitignore
+++ b/2015/schweikhardt/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2015/yang/.gitignore b/2015/yang/.gitignore
index 7e746a13e..c5646b5f4 100644
--- a/2015/yang/.gitignore
+++ b/2015/yang/.gitignore
@@ -5,3 +5,4 @@ prog_c90
 prog_c99
 prog_cpp11
 prog_cpp98
+prog.orig
diff --git a/2015/yang/Makefile b/2015/yang/Makefile
index e35e6b12e..89d93999a 100644
--- a/2015/yang/Makefile
+++ b/2015/yang/Makefile
@@ -87,7 +87,8 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-c99-compat -Wno-comma -Wno-double-promotion -Wno-float-conversion \
 	-Wno-implicit-float-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-unreachable-code
+	-Wno-unreachable-code -Wno-c++98-compat -Wno-old-style-cast \
+	-Wno-zero-as-null-pointer-constant
 #
 CWARN+= -Weverything
 #
diff --git a/2018/algmyr/.gitignore b/2018/algmyr/.gitignore
index 2b938ed7c..fffe7d584 100644
--- a/2018/algmyr/.gitignore
+++ b/2018/algmyr/.gitignore
@@ -2,3 +2,4 @@ out.raw
 prog
 prog.alt
 spectrogram.png
+prog.orig
diff --git a/2018/algmyr/Makefile b/2018/algmyr/Makefile
index 661ea0121..1db58e843 100644
--- a/2018/algmyr/Makefile
+++ b/2018/algmyr/Makefile
@@ -86,7 +86,8 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-float-conversion -Wno-float-equal -Wno-format-nonliteral \
 	-Wno-implicit-float-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shadow -Wno-shorten-64-to-32 -Wno-sign-conversion
+	-Wno-shadow -Wno-shorten-64-to-32 -Wno-sign-conversion \
+	-Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2018/anderson/.gitignore b/2018/anderson/.gitignore
index ffb16e793..160504d00 100644
--- a/2018/anderson/.gitignore
+++ b/2018/anderson/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2018/anderson/Makefile b/2018/anderson/Makefile
index 931f7f761..051abc114 100644
--- a/2018/anderson/Makefile
+++ b/2018/anderson/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-unsequenced
+CSILENCE= -Wno-unsequenced -Wno-self-assign -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2018/bellard/.gitignore b/2018/bellard/.gitignore
index 02b46d4fd..59634cd91 100644
--- a/2018/bellard/.gitignore
+++ b/2018/bellard/.gitignore
@@ -4,3 +4,4 @@ small.jpg
 fruits.ppm
 lena512.ppm
 vintage_cars.ppm
+prog.orig
diff --git a/2018/bellard/Makefile b/2018/bellard/Makefile
index 3883c6d99..f53321541 100644
--- a/2018/bellard/Makefile
+++ b/2018/bellard/Makefile
@@ -40,7 +40,7 @@ include ../../var.mk
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
 	-Wno-logical-op-parentheses -Wno-main -Wno-parentheses -Wno-pedantic \
-	-Wno-return-type -Wno-shift-op-parentheses
+	-Wno-return-type -Wno-shift-op-parentheses -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2018/burton1/.gitignore b/2018/burton1/.gitignore
index ffb16e793..160504d00 100644
--- a/2018/burton1/.gitignore
+++ b/2018/burton1/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2018/burton1/Makefile b/2018/burton1/Makefile
index 8f4b5306f..ddb48312a 100644
--- a/2018/burton1/Makefile
+++ b/2018/burton1/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
-	-Wno-implicit-int -Wno-main
+	-Wno-implicit-int -Wno-main -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
diff --git a/2018/burton2/.gitignore b/2018/burton2/.gitignore
index c6aed3e3d..005f1b557 100644
--- a/2018/burton2/.gitignore
+++ b/2018/burton2/.gitignore
@@ -1,3 +1,4 @@
 keywords
 manpage
 prog
+prog.orig
diff --git a/2018/ciura/.gitignore b/2018/ciura/.gitignore
index ffb16e793..160504d00 100644
--- a/2018/ciura/.gitignore
+++ b/2018/ciura/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2018/ciura/Makefile b/2018/ciura/Makefile
index 11834a181..4bc90b374 100644
--- a/2018/ciura/Makefile
+++ b/2018/ciura/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-shift-op-parentheses -Wno-unused-value
+CSILENCE= -Wno-shift-op-parentheses -Wno-unused-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2018/endoh1/.gitignore b/2018/endoh1/.gitignore
index 5a96aacaf..b657b9b90 100644
--- a/2018/endoh1/.gitignore
+++ b/2018/endoh1/.gitignore
@@ -4,3 +4,4 @@ output.gif
 prog
 prog.gif
 smily.gif
+prog.orig
diff --git a/2018/endoh1/Makefile b/2018/endoh1/Makefile
index 59fab8055..c0ff3461d 100644
--- a/2018/endoh1/Makefile
+++ b/2018/endoh1/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2018/endoh2/.gitignore b/2018/endoh2/.gitignore
index 171034a00..9c278530b 100644
--- a/2018/endoh2/.gitignore
+++ b/2018/endoh2/.gitignore
@@ -1,3 +1,4 @@
 prog
 prog_next
 prog_next.c
+prog.orig
diff --git a/2018/endoh2/Makefile b/2018/endoh2/Makefile
index 7de91c748..60e85553a 100644
--- a/2018/endoh2/Makefile
+++ b/2018/endoh2/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -83,7 +83,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-missing-variable-declarations -Wno-poison-system-directories
 #
 CWARN+= -Weverything
 #
diff --git a/2018/ferguson/.gitignore b/2018/ferguson/.gitignore
index eaf5aa5a9..8057d8cdb 100644
--- a/2018/ferguson/.gitignore
+++ b/2018/ferguson/.gitignore
@@ -3,3 +3,4 @@ prog.alt
 prog.orig
 weasel
 weasel.alt
+prog.orig
diff --git a/2018/ferguson/Makefile b/2018/ferguson/Makefile
index 4429b4171..0a1d73574 100644
--- a/2018/ferguson/Makefile
+++ b/2018/ferguson/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2018/giles/.gitignore b/2018/giles/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2018/giles/.gitignore
+++ b/2018/giles/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2018/giles/Makefile b/2018/giles/Makefile
index ad53e87f4..c727547a6 100644
--- a/2018/giles/Makefile
+++ b/2018/giles/Makefile
@@ -84,7 +84,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-poison-system-directories -Wno-float-conversion -Wno-missing-prototypes \
-	-Wno-missing-variable-declarations -Wno-padded
+	-Wno-missing-variable-declarations -Wno-padded -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2018/hou/.gitignore b/2018/hou/.gitignore
index 864ca68c2..a94800d30 100644
--- a/2018/hou/.gitignore
+++ b/2018/hou/.gitignore
@@ -2,3 +2,4 @@ ioccc.html
 ioccc.json
 output.html
 prog
+prog.orig
diff --git a/2018/hou/Makefile b/2018/hou/Makefile
index 3e66d61fc..80209b3f2 100644
--- a/2018/hou/Makefile
+++ b/2018/hou/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-absolute-value
+CSILENCE= -Wno-absolute-value -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2018/mills/.gitignore b/2018/mills/.gitignore
index 0b2e2bf71..e9eb0cb87 100644
--- a/2018/mills/.gitignore
+++ b/2018/mills/.gitignore
@@ -7,3 +7,4 @@ rk05.v6.fs
 v0
 v6
 v6.img.bz2
+prog.orig
diff --git a/2018/mills/Makefile b/2018/mills/Makefile
index 82c60478b..68ab5e06f 100644
--- a/2018/mills/Makefile
+++ b/2018/mills/Makefile
@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-gnu-empty-initializer -Wno-missing-field-initializers
+CSILENCE= -Wno-gnu-empty-initializer -Wno-missing-field-initializers \
+	-Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2018/poikola/.gitignore b/2018/poikola/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2018/poikola/.gitignore
+++ b/2018/poikola/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2018/poikola/Makefile b/2018/poikola/Makefile
index 30589689d..7948427d9 100644
--- a/2018/poikola/Makefile
+++ b/2018/poikola/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-comment -Wno-dollar-in-identifier-extension -Wno-string-plus-int \
-	-Wno-unused-parameter
+	-Wno-unused-parameter -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #
@@ -87,7 +87,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-date-time -Wno-float-conversion \
 	-Wno-implicit-float-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shadow -Wno-sign-conversion
+	-Wno-shadow -Wno-sign-conversion -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2018/vokes/.gitignore b/2018/vokes/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2018/vokes/.gitignore
+++ b/2018/vokes/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2018/vokes/Makefile b/2018/vokes/Makefile
index 91c6952a6..64ac05830 100644
--- a/2018/vokes/Makefile
+++ b/2018/vokes/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-deprecated-non-prototype -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2018/yang/.gitignore b/2018/yang/.gitignore
index 21bbf7fe5..7a1cb2b9c 100644
--- a/2018/yang/.gitignore
+++ b/2018/yang/.gitignore
@@ -11,3 +11,4 @@ shift
 rotated_counterclockwise.txt
 rotated_clockwise.txt
 no_leading_space.txt
+prog.orig
diff --git a/2018/yang/Makefile b/2018/yang/Makefile
index 2f0498f4b..2ade1ef36 100644
--- a/2018/yang/Makefile
+++ b/2018/yang/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2019/adamovsky/.gitignore b/2019/adamovsky/.gitignore
index 1de53bd06..ea11b0520 100644
--- a/2019/adamovsky/.gitignore
+++ b/2019/adamovsky/.gitignore
@@ -2,3 +2,4 @@ identify.unl
 iocccsize_2018
 prog
 prog2
+prog.orig
diff --git a/2019/adamovsky/Makefile b/2019/adamovsky/Makefile
index 4e80e1d3f..bf20cc594 100644
--- a/2019/adamovsky/Makefile
+++ b/2019/adamovsky/Makefile
@@ -85,7 +85,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-missing-noreturn -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-trigraphs -Wno-unused-macros -Wno-shorten-64-to-32
+	-Wno-trigraphs -Wno-unused-macros -Wno-shorten-64-to-32 \
+	-Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2019/burton/.gitignore b/2019/burton/.gitignore
index eb82d7149..7615e3f6f 100644
--- a/2019/burton/.gitignore
+++ b/2019/burton/.gitignore
@@ -2,3 +2,4 @@ prog
 prog.clean
 correct
 remarks
+prog.orig
diff --git a/2019/burton/Makefile b/2019/burton/Makefile
index ad0d624c2..046b31fd8 100644
--- a/2019/burton/Makefile
+++ b/2019/burton/Makefile
@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-parentheses
+	-Wno-parentheses -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2019/ciura/.gitignore b/2019/ciura/.gitignore
index ffb16e793..160504d00 100644
--- a/2019/ciura/.gitignore
+++ b/2019/ciura/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2019/ciura/Makefile b/2019/ciura/Makefile
index 9b8cfa2de..086e25570 100644
--- a/2019/ciura/Makefile
+++ b/2019/ciura/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body -Wno-parentheses -Wno-string-plus-int
+CSILENCE= -Wno-empty-body -Wno-parentheses -Wno-string-plus-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2019/diels-grabsch1/.gitignore b/2019/diels-grabsch1/.gitignore
index e86bb0e4d..99c47509b 100644
--- a/2019/diels-grabsch1/.gitignore
+++ b/2019/diels-grabsch1/.gitignore
@@ -3,3 +3,4 @@ dg1.Z
 ref.Z
 guidelines.txt.Z
 guidelines2.txt
+prog.orig
diff --git a/2019/diels-grabsch2/.gitignore b/2019/diels-grabsch2/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2019/diels-grabsch2/.gitignore
+++ b/2019/diels-grabsch2/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2019/dogon/.gitignore b/2019/dogon/.gitignore
index 4bfcb8133..f3c420315 100644
--- a/2019/dogon/.gitignore
+++ b/2019/dogon/.gitignore
@@ -1,2 +1,3 @@
 apholife
 prog
+prog.orig
diff --git a/2019/dogon/Makefile b/2019/dogon/Makefile
index fb21b973d..72a830357 100644
--- a/2019/dogon/Makefile
+++ b/2019/dogon/Makefile
@@ -41,7 +41,8 @@ include ../../var.mk
 CSILENCE= -Wno-bitwise-conditional-parentheses -Wno-bitwise-op-parentheses \
 	-Wno-deprecated-declarations -Wno-format -Wno-parentheses \
 	-Wno-shift-op-parentheses -Wno-sign-compare -Wno-unused-variable \
-	-Wno-main-return-type -Wno-return-type -Wno-unused-parameter -Wno-implicit-function-declaration
+	-Wno-main-return-type -Wno-return-type -Wno-unused-parameter \
+	-Wno-strict-prototypes -Wno-implicit-function-declaration
 
 # Common C compiler warning flags
 #
@@ -89,7 +90,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-cast-align -Wno-comma -Wno-conditional-uninitialized \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-shadow -Wno-shorten-64-to-32 \
-	-Wno-sign-conversion -Wno-missing-noreturn
+	-Wno-sign-conversion -Wno-missing-noreturn -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2019/duble/.gitignore b/2019/duble/.gitignore
index 2b8115603..f4f9fbccd 100644
--- a/2019/duble/.gitignore
+++ b/2019/duble/.gitignore
@@ -7,3 +7,4 @@ Linux.alt
 prog
 prog.alt
 .[A-Z][A-Z]*
+prog.orig
diff --git a/2019/duble/Makefile b/2019/duble/Makefile
index 3953508ca..7989b132d 100644
--- a/2019/duble/Makefile
+++ b/2019/duble/Makefile
@@ -86,7 +86,9 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-bad-function-cast -Wno-comma -Wno-implicit-int-conversion \
+        -Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-shadow \
+        -Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/2019/endoh/.gitignore b/2019/endoh/.gitignore
index b9906ca11..3bdaa29e9 100644
--- a/2019/endoh/.gitignore
+++ b/2019/endoh/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog2.c
+prog.orig
diff --git a/2019/endoh/Makefile b/2019/endoh/Makefile
index ed4a3aa2c..1759b9169 100644
--- a/2019/endoh/Makefile
+++ b/2019/endoh/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2019/giles/.gitignore b/2019/giles/.gitignore
index 6b337270c..0f4a71bf9 100644
--- a/2019/giles/.gitignore
+++ b/2019/giles/.gitignore
@@ -1,2 +1,3 @@
 prog
 out.wav
+prog.orig
diff --git a/2019/giles/Makefile b/2019/giles/Makefile
index 0fd0bfd7d..caa95df27 100644
--- a/2019/giles/Makefile
+++ b/2019/giles/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body
+CSILENCE= -Wno-empty-body -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -86,7 +86,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-cast-align -Wno-comma -Wno-double-promotion -Wno-format-nonliteral \
 	-Wno-implicit-float-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-sign-conversion -Wno-strict-prototypes
+	-Wno-sign-conversion -Wno-strict-prototypes -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2019/karns/.gitignore b/2019/karns/.gitignore
index ce21b5d86..2c4ecd675 100644
--- a/2019/karns/.gitignore
+++ b/2019/karns/.gitignore
@@ -1,2 +1,3 @@
 prog
 tbfs
+prog.orig
diff --git a/2019/karns/Makefile b/2019/karns/Makefile
index ebcf1f63a..f8e14f758 100644
--- a/2019/karns/Makefile
+++ b/2019/karns/Makefile
@@ -41,7 +41,7 @@ include ../../var.mk
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
 	-Wno-incompatible-function-pointer-types -Wno-logical-op-parentheses \
 	-Wno-sign-compare -Wno-tautological-bitwise-compare -Wno-unused-label \
-	-Wno-unused-variable
+	-Wno-unused-variable -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -88,7 +88,7 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-conditional-uninitialized -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-shadow -Wno-shorten-64-to-32 \
-	-Wno-sign-conversion
+	-Wno-sign-conversion -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2019/lynn/.gitignore b/2019/lynn/.gitignore
index 3433e45e6..4964e59a4 100644
--- a/2019/lynn/.gitignore
+++ b/2019/lynn/.gitignore
@@ -7,3 +7,4 @@ lol
 lol.c
 scc
 scc.c
+prog.orig
diff --git a/2019/lynn/Makefile b/2019/lynn/Makefile
index c3d5ae06a..e354b3d4e 100644
--- a/2019/lynn/Makefile
+++ b/2019/lynn/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -84,8 +84,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-missing-prototypes -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories -Wno-shadow -Wno-sign-conversion \
-	-Wno-strict-prototypes
+	-Wno-poison-system-directories -Wno-shadow -Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
diff --git a/2019/mills/.gitignore b/2019/mills/.gitignore
index 2b08c9ffe..dd047d540 100644
--- a/2019/mills/.gitignore
+++ b/2019/mills/.gitignore
@@ -21,3 +21,4 @@ rnn1
 rnn2
 rnn3
 IOCCC-hints.output.txt
+prog.orig
diff --git a/2019/mills/Makefile b/2019/mills/Makefile
index 6bfe1b34a..7bbbbf08e 100644
--- a/2019/mills/Makefile
+++ b/2019/mills/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-for-loop-analysis -Wno-missing-field-initializers
+CSILENCE= -Wno-for-loop-analysis -Wno-missing-field-initializers -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -87,7 +87,8 @@ CSILENCE+= -Wno-double-promotion -Wno-float-conversion -Wno-format-nonliteral \
 	-Wno-implicit-float-conversion -Wno-implicit-int-conversion \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-shadow -Wno-shorten-64-to-32 \
-	-Wno-sign-conversion -Wno-strict-prototypes -Wno-vla
+	-Wno-sign-conversion -Wno-strict-prototypes -Wno-vla \
+	-Wno-conditional-uninitialized -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2019/poikola/.gitignore b/2019/poikola/.gitignore
index 15f6a50a4..9a9345e04 100644
--- a/2019/poikola/.gitignore
+++ b/2019/poikola/.gitignore
@@ -1,2 +1,3 @@
 prog
 poikola.pdf
+prog.orig
diff --git a/2019/poikola/Makefile b/2019/poikola/Makefile
index 0060ebf1e..400d17110 100644
--- a/2019/poikola/Makefile
+++ b/2019/poikola/Makefile
@@ -87,7 +87,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-conditional-uninitialized -Wno-date-time \
 	-Wno-implicit-int-conversion -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-shorten-64-to-32 -Wno-sign-conversion \
-	-Wno-unreachable-code
+	-Wno-unreachable-code -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2019/yang/.gitignore b/2019/yang/.gitignore
index 40e391dd1..dca012991 100644
--- a/2019/yang/.gitignore
+++ b/2019/yang/.gitignore
@@ -5,3 +5,4 @@ d
 prog
 e
 output.txt
+prog.orig
diff --git a/2019/yang/Makefile b/2019/yang/Makefile
index 4ba3fca6e..02628b59c 100644
--- a/2019/yang/Makefile
+++ b/2019/yang/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2020/burton/.gitignore b/2020/burton/.gitignore
index 8e352add8..d0ea0f76c 100644
--- a/2020/burton/.gitignore
+++ b/2020/burton/.gitignore
@@ -1,3 +1,4 @@
 prog
 prog_be
 prog_le
+prog.orig
diff --git a/2020/carlini/.gitignore b/2020/carlini/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2020/carlini/.gitignore
+++ b/2020/carlini/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2020/carlini/Makefile b/2020/carlini/Makefile
index ab00f6bbb..0f3780a38 100644
--- a/2020/carlini/Makefile
+++ b/2020/carlini/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-overlength-strings
+CSILENCE= -Wno-overlength-strings -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2020/endoh1/.gitignore b/2020/endoh1/.gitignore
index ffb16e793..160504d00 100644
--- a/2020/endoh1/.gitignore
+++ b/2020/endoh1/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2020/endoh1/Makefile b/2020/endoh1/Makefile
index 0062d7f40..59d0ee610 100644
--- a/2020/endoh1/Makefile
+++ b/2020/endoh1/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2020/endoh2/.gitignore b/2020/endoh2/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2020/endoh2/.gitignore
+++ b/2020/endoh2/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2020/endoh2/Makefile b/2020/endoh2/Makefile
index c38ef5e80..26d14f08e 100644
--- a/2020/endoh2/Makefile
+++ b/2020/endoh2/Makefile
@@ -86,7 +86,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-conversion -Wno-documentation -Wno-double-promotion \
 	-Wno-missing-prototypes -Wno-missing-variable-declarations \
 	-Wno-poison-system-directories -Wno-redundant-parens -Wno-shadow \
-	-Wno-sign-conversion
+	-Wno-sign-conversion -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2020/endoh3/.gitignore b/2020/endoh3/.gitignore
index 7b0f11efd..152cc39a2 100644
--- a/2020/endoh3/.gitignore
+++ b/2020/endoh3/.gitignore
@@ -2,3 +2,4 @@ clock
 clock.c
 prog
 prog.alt
+prog.orig
diff --git a/2020/endoh3/Makefile b/2020/endoh3/Makefile
index 85173fec9..b9c7d8cd9 100644
--- a/2020/endoh3/Makefile
+++ b/2020/endoh3/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2020/ferguson1/.gitignore b/2020/ferguson1/.gitignore
index 560d31973..a076e585d 100644
--- a/2020/ferguson1/.gitignore
+++ b/2020/ferguson1/.gitignore
@@ -5,3 +5,4 @@ snake
 snake-colours
 snake.alt
 termcaps
+prog.orig
diff --git a/2020/ferguson1/Makefile b/2020/ferguson1/Makefile
index a1663a1eb..ceb324c2f 100644
--- a/2020/ferguson1/Makefile
+++ b/2020/ferguson1/Makefile
@@ -88,7 +88,8 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE= -Wno-unused-value -Wno-misleading-indentation -Wno-parentheses \
-	  -Wno-unknown-warning-option -Wno-poison-system-directories
+	  -Wno-unknown-warning-option -Wno-poison-system-directories \
+	  -Wno-declaration-after-statement -Wno-padded
 #
 CWARN+= -Weverything
 #
diff --git a/2020/ferguson2/.gitignore b/2020/ferguson2/.gitignore
index 7fd89fc87..f505c425b 100644
--- a/2020/ferguson2/.gitignore
+++ b/2020/ferguson2/.gitignore
@@ -3,3 +3,4 @@ recode
 chocolate-cake.dat
 chocolate-cake.key
 cake.sh
+prog.orig
diff --git a/2020/ferguson2/Makefile b/2020/ferguson2/Makefile
index daa478f65..fdb7eb9c3 100644
--- a/2020/ferguson2/Makefile
+++ b/2020/ferguson2/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-empty-body
 
 # Common C compiler warning flags
 #
@@ -83,7 +83,7 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE= -Wno-implicit-int-conversion -Wno-missing-prototypes \
+CSILENCE+= -Wno-implicit-int-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
 	-Wno-shorten-64-to-32
 #
diff --git a/2020/giles/.gitignore b/2020/giles/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2020/giles/.gitignore
+++ b/2020/giles/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2020/giles/Makefile b/2020/giles/Makefile
index 5afe40294..91631d354 100644
--- a/2020/giles/Makefile
+++ b/2020/giles/Makefile
@@ -85,7 +85,8 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-disabled-macro-expansion -Wno-float-conversion -Wno-float-equal \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shadow -Wno-shorten-64-to-32 -Wno-sign-conversion
+	-Wno-shadow -Wno-shorten-64-to-32 -Wno-sign-conversion \
+	-Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2020/kurdyukov1/.gitignore b/2020/kurdyukov1/.gitignore
index ffb16e793..160504d00 100644
--- a/2020/kurdyukov1/.gitignore
+++ b/2020/kurdyukov1/.gitignore
@@ -1,2 +1,3 @@
 prog
 prog.alt
+prog.orig
diff --git a/2020/kurdyukov1/Makefile b/2020/kurdyukov1/Makefile
index 344a5aca9..d6a4cc423 100644
--- a/2020/kurdyukov1/Makefile
+++ b/2020/kurdyukov1/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2020/kurdyukov2/.gitignore b/2020/kurdyukov2/.gitignore
index cffdb9f98..ce9fefa7d 100644
--- a/2020/kurdyukov2/.gitignore
+++ b/2020/kurdyukov2/.gitignore
@@ -1,3 +1,4 @@
 prog
 prog_png
 prog_ppm
+prog.orig
diff --git a/2020/kurdyukov3/.gitignore b/2020/kurdyukov3/.gitignore
index 44815ac94..d68544fe8 100644
--- a/2020/kurdyukov3/.gitignore
+++ b/2020/kurdyukov3/.gitignore
@@ -1,3 +1,4 @@
 prog
 prog.alt
 prog.extra
+prog.orig
diff --git a/2020/kurdyukov3/Makefile b/2020/kurdyukov3/Makefile
index 781b8d180..4b3dc3713 100644
--- a/2020/kurdyukov3/Makefile
+++ b/2020/kurdyukov3/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -84,7 +84,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-conditional-uninitialized -Wno-poison-system-directories \
-	-Wno-shorten-64-to-32 -Wno-sign-conversion
+	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2020/kurdyukov4/.gitignore b/2020/kurdyukov4/.gitignore
index 918bc4647..a61303c6e 100644
--- a/2020/kurdyukov4/.gitignore
+++ b/2020/kurdyukov4/.gitignore
@@ -1,3 +1,4 @@
 prog
 rand
 test.txt
+prog.orig
diff --git a/2020/kurdyukov4/Makefile b/2020/kurdyukov4/Makefile
index 102ad4463..bfaa0b335 100644
--- a/2020/kurdyukov4/Makefile
+++ b/2020/kurdyukov4/Makefile
@@ -84,7 +84,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-comma -Wno-implicit-int-conversion -Wno-poison-system-directories \
-	-Wno-shorten-64-to-32 -Wno-sign-conversion
+	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-unused-macros
 #
 CWARN+= -Weverything
 #
diff --git a/2020/otterness/.gitignore b/2020/otterness/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2020/otterness/.gitignore
+++ b/2020/otterness/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2020/otterness/Makefile b/2020/otterness/Makefile
index f09e81333..7101a11ad 100644
--- a/2020/otterness/Makefile
+++ b/2020/otterness/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE=
+CSILENCE= -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
diff --git a/2020/tsoj/.gitignore b/2020/tsoj/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2020/tsoj/.gitignore
+++ b/2020/tsoj/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/2020/tsoj/Makefile b/2020/tsoj/Makefile
index aef365109..7507f62cb 100644
--- a/2020/tsoj/Makefile
+++ b/2020/tsoj/Makefile
@@ -38,7 +38,7 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-empty-body -Wno-missing-field-initializers
+CSILENCE= -Wno-empty-body -Wno-missing-field-initializers -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #
@@ -86,7 +86,7 @@ ifeq ($(CC),clang)
 CSILENCE+= -Wno-comma -Wno-float-conversion -Wno-implicit-float-conversion \
 	-Wno-missing-prototypes -Wno-poison-system-directories -Wno-shadow \
 	-Wno-shorten-64-to-32 -Wno-sign-conversion -Wno-strict-prototypes \
-	-Wno-vla
+	-Wno-vla -Wno-declaration-after-statement
 #
 CWARN+= -Weverything
 #
diff --git a/2020/yang/.gitignore b/2020/yang/.gitignore
index ea1749132..a1e7bc695 100644
--- a/2020/yang/.gitignore
+++ b/2020/yang/.gitignore
@@ -1 +1,2 @@
 prog
+prog.orig
diff --git a/thanks-for-fixes.md b/thanks-for-fixes.md
index 1949c0779..86a8c81cf 100644
--- a/thanks-for-fixes.md
+++ b/thanks-for-fixes.md
@@ -109,12 +109,8 @@ changed the `#o` lines to `#define`. The
 [lycklama.alt.c](1985/lycklama/lycklama.alt.c) is the original source
 code as it provides some fun input for the entry.
 
-Yusuke provided some useful information that amounts to an alternate version but
-which does not actually modify the code except by a provided macro for a
-`usleep()` call which Cody added. This was not put in an alt file because the
-original code is in the alt file but the default to the `usleep()` call is 0,
-making it functionally equivalent not calling it.  See the README.md file
-details.
+Yusuke provided some useful information that amounts to an alternate version
+that Cody added. See the README.md for details.
 
 
 ## [1985/sicherman](1985/sicherman/sicherman.c) ([README.md](1985/sicherman/README.md]))