target_sources( gui
    PRIVATE
    qgldrawbuffersurface.cpp
    qglabstractsurface.h
    qglpaintersurface.cpp
    qglwidgetsurface.h
    qglpaintersurface_p.h
    qglsubsurface.h
    qglframebufferobjectsurface.cpp
    qglmaskedsurface.cpp
    qglwidgetsurface.cpp
    qglpixelbuffersurface.cpp
    qglsubsurface.cpp
    qglframebufferobjectsurface.h
    qglcontextsurface.cpp
    qglcontextsurface_p.h
    qglmaskedsurface_p.h
    qglabstractsurface.cpp
    qgldrawbuffersurface_p.h
    qglpixelbuffersurface.h     
    )
