$OpenBSD$
--- neo/idlib/CMakeLists.txt.orig	Mon Jul 21 18:04:12 2014
+++ neo/idlib/CMakeLists.txt	Mon Jul 21 20:01:32 2014
@@ -112,6 +112,8 @@ else()
 			)
 	endforeach()
 	
+	find_package(OpenGL REQUIRED)
+	include_directories(${OPENGL_INCLUDE_DIR})
 	include_directories(.)
 	
 	# precompiled magic for GCC/clang, adapted from https://gist.github.com/573926