fix Makefile, README.md and code for 2004/newbern

2004/newbern/Makefile

@@ -63,7 +63,7 @@ X11_INCDIR= /opt/X11/include
 # Common C compiler warnings to silence
 #
 #CSILENCE=
-CSILENCE= -Wno-parentheses -Wno-pointer-sign
+CSILENCE= -Wno-parentheses -Wno-pointer-sign -Wno-incompatible-pointer-types
 
 # Common C compiler warning flags
 #
@@ -101,7 +101,7 @@ CINCLUDE=
 #CINCLUDE= -include stdlib.h
 #CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h -include stdio.h
-#CINCLUDE= -I ${X11_INCDIR}
+#CINCLUDE= -I ${X11_INCDIR} -I ${X11_INCDIR}/X11
 #CINCLUDE= `${SDL2_CONFIG} --cflags`
 
 # Optimization
@@ -140,7 +140,7 @@ ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-array-bounds-pointer-arithmetic -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-sign-conversion -Wno-strict-prototypes
+	-Wno-sign-conversion -Wno-strict-prototypes -Wno-conditional-uninitialized
 #
 CWARN+= -Weverything
 #