err message: you need to update to new API when compling gnome-sessions

an error message during complie of gnome-sessions said : Warning: constructor for GnomeCanvasBPath [or GnomeCanvasXxxx for several diferent things] refer to live.gnome.org/ PyGTK_2fWhatsNew28#update-constructors which however was a 404 error. I finally found the reference here: http://forums.gentoo.org/ viewtopic.php?t=578120 pls advise