Possible arguments: (none)
Provides an easy way to depend on
      GL components.  The components
      should be listed in USE_GL.  The available
      components are:
egladd a library dependency on libEGL.so
	    from graphics/mesa-libs
gbmAdd a library dependency on libgbm.so
	    from graphics/mesa-libs
glAdd a library dependency on libGL.so
	    from graphics/mesa-libs
glesv2Add a library dependency on libGLESv2.so
	    from graphics/mesa-libs
glewAdd a library dependency on libGLEW.so
	    from graphics/glew
gluAdd a library dependency on libGLU.so
	    from graphics/libGLU
glutAdd a library dependency on libglut.so
	    from graphics/freeglut
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