$OpenBSD$
$NetBSD: patch-ag,v 1.1 2008/03/14 14:49:53 drochner Exp $

--- simgear/screen/extensions.hxx.orig	Sat Nov 17 10:35:45 2007
+++ simgear/screen/extensions.hxx	Mon Sep 21 17:07:48 2009
@@ -415,6 +415,7 @@ typedef BOOL (APIENTRY * wglSetPbufferAttribARBProc) (
 
 /* GLX pcific OpenGL extenstions */
 #include <GL/glx.h>
+#include <GL/glxext.h>
 
 #ifndef GLX_ARB_multisample
 #define GLX_ARB_multisample1