$OpenBSD: patch-src_opengl_c,v 1.2 2012/03/14 22:54:28 sthen Exp $
--- src/opengl.c.orig	Wed Feb 29 23:42:05 2012
+++ src/opengl.c	Sun Mar 11 20:03:21 2012
@@ -38,6 +38,7 @@
 #include <stdio.h>
 #include "nstring.h"
 #include <stdarg.h> /* va_list for gl_print */
+#include <zlib.h>
 
 #include <zlib.h> /* Z_DEFAULT_COMPRESSION */ 
 #include <png.h>
