extension point is now deprecated, see commit 9b262f1c5fe5a6fd879f17cd7b80d8c54e33d80c in upstream glib git repository. A possible temporary solution would be to remove -DG_DISABLE_DEPRECATED from libgiofm_la_CFLAGS in src/Makefile.am. However, since it's just an extension (if I read it correctly, I'm no expert of glib at all) I guess the real solution would be to just remove gio subdirectory.
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