diff --git a/Makefile b/Makefile
index d808d5a0..a0dec75a 100644
--- a/Makefile
+++ b/Makefile
@@ -185,7 +185,8 @@ ifeq ($(OS),Darwin)
 	MWINDOWS =
 
 	# workaround: http://developer.apple.com/qa/qa2007/qa1567.html
-	LIBS_GL=-lGL -lX11 -dylib_file /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
+	LIBS_GL += -lX11 -dylib_file /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
+	LIBS_GTKGLEXT += -lX11 -dylib_file /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
 
 #$(error Unsupported build OS: $(OS) - please complete the Darwin support in this Makefile and submit a patch)
 else