--- ClanLib-0.6.3/Sources/GL/GLX/displaycard_glx.h.orig	2002-10-23 19:35:17 +0400
+++ ClanLib-0.6.3/Sources/GL/GLX/displaycard_glx.h	2002-10-23 19:35:25 +0400
@@ -20,6 +20,7 @@
 #include "Display/Display/X11/display_xwindow.h"
 #include "Display/Display/X11/x11_resolution.h"
 #include "GL/Generic/displaycard_gl_generic.h"
+#define GLX_GLXEXT_PROTOTYPES 1
 #include <GL/glx.h>
 #include <iostream>