I see an import of Gtk and of threading. That GTK+ 3 does not support threading very well is one of the main reasons we ported from olpcgames to sugargame. Don't forget to test this on a multiprocessor system under load. Consider completing the port to sugargame.

This seems to be a duplicate. Please put all the necessary require_version calls in the main program?

Is the import needed? I see no reference to it in the file.