Make 1984/decot compile under linux

This will not compile with clang which is actually what gcc is under
macOS. Unfortunately clang does not support -traditional-cpp which this
entry requires for modern systems.

We would like to thank Yusuke Endoh for the patch to get this to compile
with gcc. Thank you very much Yusuke!

1984/decot/Makefile

@@ -104,7 +104,7 @@ ARCH=
 
 # Defines that are needed to compile
 #
-CDEFINE=
+CDEFINE= -traditional-cpp
 #CDEFINE= -DIOCCC=26
 
 # Include files that are needed to compile
@@ -195,7 +195,8 @@ all: ${DATA} ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	@echo "NOTE: This entry may not compile when using modern compilers."
+	@echo "NOTE: This entry will not compile when using clang because it does not support"
+	@echo "      -traditional-cpp but it should compile with gcc."
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
 # alternative executable

1984/decot/README.md

@@ -10,7 +10,13 @@ NOTE: This entry may not compile when using modern compilers.
 
 ## Judges' comments:
 
-Some new compilers disliked line 15 of the source, so we changed it from:
+NOTE: On modern systems this entry requires the option `-traditional-cpp` which
+clang does not support. We thank Yusuke Endoh for his patch which allows the
+entry to compile under gcc! Please be advised that gcc under macOS is actually
+clang so this will not compile with the default gcc under macOS.
+
+Some new (in 1984) compilers disliked line 15 of the source, so we changed it
+from:
 
 	for(signal=0;*k * x * __FILE__ *i;) do {
 
@@ -22,6 +28,7 @@ This program prints out a string of garbage.
 
 The judges also offer this one comment: understand comments!
 
+
 Copyright (c) 1984, Landon Curt Noll.
 All Rights Reserved.  Permission for personal, educational or non-profit use is
 granted provided this this copyright and notice are included in its entirety

1984/decot/decot.c

@@ -3,7 +3,6 @@
 #define char k['a']
 #define union static struct
 
-extern int floor;
 double (x1, y1) b,
 char x {sizeof(
     double(%s,%D)(*)())
@@ -24,7 +23,7 @@ _O: while (!(char <<x - dup)) {	/*/*\*/
 
 while(b x 3, i); {
 char x b,i;
-  _0:if(b&&k+
+  _0:if(b&&(int)k+
   sin(signal)		/ *    ((main) (b)-> xO));/*}
   ;
 }