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
Since gtk-doc is an optional dependency for Cogl then we need to special case how EXTRA_DIST is initialized. It shouldn't be set when using gtk-doc since gtk-doc.make expects to initialize EXTRA_DIST. If we aren't using gtk-doc then it should be initialized to an empty value instead of including gtk-doc.make so that the later lines that append various extra png files to EXTRA_DIST won't fail.