According to http://www.gnome.org/~fpeters/299.html
farsight2 (0.0.9) uses deprecated Glib+ symbols:
See http://live.gnome.org/GnomeGoals/RemoveDeprecatedSymbols/Glib and
Hello, I've reopened this bug seems that you are using a deprecated Glib symbol: glib_mapped_file_free()
Created attachment 31714 [details] [review]
Thanks for the patch, is in master.