target_sources( gui
    PRIVATE
    qglabstractmaterial.h
    qgltwosidedmaterial.cpp
    qglcolormaterial.h
    qglcolormaterial.cpp
    qgltwosidedmaterial.h
    qglmaterial.h
    qglabstractmaterial.cpp
    qglmaterial_p.h
    qglmaterial.cpp     
    )
