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Cogl has some experimental API developers are welcomed to play
      with. The main drawback when using those is that there is no API
      stability guarantee, functions flagged as experimental could be changed
      or removed in future versions of the library. To use this experimental
      API you will need to define
      COGL_ENABLE_EXPERIMENTAL_API before including
      <clutter/clutter.h> or
      <cogl/cogl.h>.