From dc01deda0019e5af2f76256b36ada4faee34ce86 Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Sat, 5 Sep 2015 15:36:28 +0000
Subject: [PATCH] Mac OS platform: Allow compilation of user code with
 non-Apple compiler.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10853 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 FL/gl.h | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/FL/gl.h b/FL/gl.h
index c4d6abcd8..b59ddc173 100644
--- a/FL/gl.h
+++ b/FL/gl.h
@@ -56,13 +56,15 @@
 
 #  ifdef __APPLE__
 #    include <OpenGL/gl.h>
-#    include <FL/x.H>  // makes sure MAC_OS_X_VERSION_10_4 is defined
-#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4
-#    include <OpenGL/glext.h>
-#endif
+#    ifdef FL_LIBRARY
+#      include <FL/x.H>
+#      if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4
+#        include <OpenGL/glext.h>
+#      endif
+#    endif // FL_LIBRARY
 #  else
 #    include <GL/gl.h>
-#  endif
+#  endif  // __APPLE__
 
 FL_EXPORT void gl_start();
 FL_EXPORT void gl_finish();