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FindOpenGL
FindModule for OpenGL and GLU.
Result Variables
This module sets the following variables:
OPENGL_FOUND- True, if the system has OpenGL.
 OPENGL_XMESA_FOUND- True, if the system has XMESA.
 OPENGL_GLU_FOUND- True, if the system has GLU.
 OPENGL_INCLUDE_DIR- Path to the OpenGL include directory.
 OPENGL_LIBRARIES- Paths to the OpenGL and GLU libraries.
 
If you want to use just GL you can use these values:
OPENGL_gl_LIBRARY- Path to the OpenGL library.
 OPENGL_glu_LIBRARY- Path to the GLU library.
 
OSX Specific
On OSX default to using the framework version of OpenGL. People will have to change the cache values of OPENGL_glu_LIBRARY and OPENGL_gl_LIBRARY to use OpenGL with X11 on OSX.
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 https://cmake.org/cmake/help/v3.6/module/FindOpenGL.html