--- src/client/renderer/r_program.h	2014-06-05 06:18:39.000000000 +0200
+++ src/client/renderer/r_program.h	2017-01-25 16:15:42.467269009 +0100
@@ -30,8 +30,12 @@
 	char name[MAX_QPATH];
 } r_shader_t;
 
+#if !defined(GL_UNIFORM)
 #define GL_UNIFORM 1
+#endif
+#if !defined(GL_ATTRIBUTE)
 #define GL_ATTRIBUTE 2
+#endif
 /* program variables */
 typedef struct r_progvar_s {
 	GLint type;
