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if (APPLE)
    message(STATUS "The OsX platform currently does not support all "
    "the OpenGL features required by the glutViewer example : skipping.")
else()
    if( OPENGL_FOUND AND GLEW_FOUND AND GLUT_FOUND)
        add_subdirectory(glutViewer)
    else()
        set(MISSING "")

        if (NOT OPENGL_FOUND)
            list(APPEND MISSING OpenGL)
        endif()

        if (NOT GLEW_FOUND)
            list(APPEND MISSING glew)
        endif()

        if (NOT GLUT_FOUND)
            list(APPEND MISSING glut)
        endif()

        message(STATUS
            "The following libraries could not be found : ${MISSING}. The glutViewer "
            "example will not be available. If you have these libraries installed, "
            "please specify their path to cmake (by setting the GLEW_LOCATION, GLUT_LOCATION "
            "entries for instance)"
        )
    endif()
endif()

if(MAYA_FOUND)
    add_subdirectory(mayaViewer)
else()
    message(STATUS
        "Maya could not be found, so the OpenSubdiv mayaViwer plugin will not "
        "be available. If you do have Maya installed and see this message, "
        "please add your Maya path to cmake/FindMaya.cmake or set it in "
        "the MAYA_LOCATION environment variable."
    )
endif()