{ libGL, runCommand }:
runCommand "fakegl" {} ''
  mkdir -p $out/include/{GL,OpenGL}
  framework=${libGL}/Library/Frameworks/OpenGL.framework/Headers
  ln -s $framework/gl.h $out/include/GL/
  ln -s $framework/{gl{ext,types},OpenGLAvailability}.h $out/include/OpenGL/
''