--- dart/gui/LoadOpengl.hpp.orig	2021-07-15 08:12:45 UTC
+++ dart/gui/LoadOpengl.hpp
@@ -46,6 +46,9 @@
 #elif defined(__linux__)
 #  include <GL/gl.h>
 #  include <GL/glu.h>
+#elif defined(__FreeBSD__)
+#  include <GL/gl.h>
+#  include <GL/glu.h>
 #elif defined(__APPLE__)
 #  include <OpenGL/gl.h>
 #  include <OpenGL/glu.h>