Chez Scheme: always disable X11 support on Mac OS

racket/src/ChezScheme/c/Mf-a6osx

@@ -16,7 +16,6 @@
 m ?= a6osx
 Cpu ?= X86_64
 
-mdinclude = -I/opt/X11/include/ 
 o = o
 mdsrc ?= i3le.c
 mdobj ?= i3le.o

racket/src/ChezScheme/c/Mf-arm64osx

@@ -16,7 +16,6 @@
 m ?= arm64osx
 Cpu ?= AARCH64
 
-mdinclude = -I/opt/X11/include/
 o = o
 mdsrc ?= arm32le.c
 mdobj ?= arm32le.o

racket/src/ChezScheme/c/Mf-i3osx

@@ -16,7 +16,6 @@
 m ?= i3osx
 Cpu ?= I386
 
-mdinclude = -I/opt/X11/include/ 
 o = o
 mdsrc ?= i3le.c
 mdobj ?= i3le.o

racket/src/ChezScheme/c/version.h

@@ -352,6 +352,9 @@ typedef int tputsputcchar;
 #define LOCKF
 #define DIRMARKERP(c) ((c) == '/')
 #ifndef DISABLE_X11
+# define DISABLE_X11
+#endif
+#ifndef DISABLE_X11
 # define LIBX11 "/usr/X11R6/lib/libX11.dylib"
 #endif
 #define _DARWIN_USE_64_BIT_INODE

racket/src/ChezScheme/configure

@@ -407,14 +407,6 @@ if [ "$installman" = "" ] ; then
   installman=$installprefix/$installmansuffix
 fi
 
-if [ "$disablex11" = "no" ] ; then
-  if [ $m = a6osx ] || [ $m = ta6osx ] ; then
-    if [ ! -d /opt/X11/include/ ] ; then
-      disablex11=yes
-    fi
-  fi
-fi
-
 if [ "$help" = "yes" ]; then
   echo "Purpose:"
   echo "  $0 determines the machine type and constructs a custom Makefile"