$OpenBSD$
--- doomsday/dep_opengl.pri.orig	Sat Jul 27 02:07:03 2013
+++ doomsday/dep_opengl.pri	Sat Jul 27 02:08:25 2013
@@ -18,5 +18,6 @@ else:macx {
 }
 else {
     # Generic Unix.
-    LIBS += -lGL -lGLU
+    INCLUDEPATH += /usr/X11R6/include
+    LIBS += -L/usr/X11R6/lib -lGL -lGLU
 }