/*
* Add the path to <GL3/gl3.h> to the CMake compiler flags, CMAKE_CXX_FLAGS and
CMAKE_CXX_FLAGS_DEBUG (for release and debug builds; others if you use other
build configurations). The text to add should look something like this:
/I 揅:\GLHeader? The folder GLHeader should contain a subfolder GL3, which in turn contains
gl3.h.
* Enable the following CMake variable:
OSG_GL3_AVAILABLE
* Disable the following CMake variables:
OSG_GL1_AVAILABLE
OSG_GL2_AVAILABLE
OSG_GLES1_AVAILABLE
OSG_GLES2_AVAILABLE
OSG_GL_DISPLAYLISTS_AVAILABLE
OSG_GL_FIXED_FUNCTION_AVAILABLE
OSG_GL_MATRICES_AVAILABLE
OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
OSG_GL_VERTEX_FUNCS_AVAILABLE
**/