$OpenBSD$
--- avogadro/src/CMakeLists.txt.orig	Sat Sep 10 21:56:10 2011
+++ avogadro/src/CMakeLists.txt	Sat Sep 10 22:06:28 2011
@@ -20,6 +20,7 @@ include_directories(
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${OPENBABEL2_INCLUDE_DIR}
   ${EIGEN2_INCLUDE_DIR}
+  ${OPENGL_INCLUDE_DIR}
   ${CMAKE_CURRENT_BINARY_DIR}
 )
 
