$ brew install pygobject3 gtk+3 $ export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:/usr/local/opt/libffi/lib/pkgconfig" $ pip install gobject PyGObject
$ brew install pygobject3 gtk+3 $ export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:/usr/local/opt/libffi/lib/pkgconfig" $ pip install gobject PyGObject