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if( OPENGL_FOUND AND (GLEW_FOUND AND GLFW_FOUND) OR (APPLE AND GLFW_FOUND))
    add_subdirectory(glViewer)
    add_subdirectory(glBatchViewer)
    add_subdirectory(simpleCpu)
    add_subdirectory(limitEval)
    if(OPENGL_4_3_FOUND)
        # the paintTest example requires GL functionality not available on OSX
        add_subdirectory(paintTest)
    endif()
    if(PTEX_FOUND AND (NOT APPLE))
        # the ptexViewer example requires GL functionality not available on OSX
        add_subdirectory(ptexViewer)
    endif()
else()
    set(MISSING "")

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

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

    if (NOT GLFW_FOUND)
        list(APPEND MISSING glfw)
    endif()

    message(WARNING
        "The following libraries could not be found : ${MISSING}.  "
        "The glViewer and ptexViewer examples will not be available.  "
        "If you have these libraries installed, please specify their "
        "path to cmake (through the GLEW_LOCATION and GLFW_LOCATION "
        "command line arguments or environment variables)."
    )
endif()

if(DXSDK_FOUND)
   add_subdirectory(dxViewer)
endif()

# XXXX manuelk : turning off the maya plugin examples for now
if(MAYA_FOUND AND (NOT APPLE))
#    add_subdirectory(mayaViewer)
    if(PTEX_FOUND)
#        add_subdirectory(mayaPtexViewer)
    endif()
endif()