When emerging quodlibet after installing new dbus (version 1.0) with dbus use flag, emerge fails with message "sys-apps/dbus-1.0.2 does not actually support the python USE flag!". dev-python/dbus-python is installed and reemerging is OK. Also there is no other dbus-specific actions in quodlibet ebuild, than checking of dbus emerged with python USE-flag.
*** This bug has been marked as a duplicate of 158294 ***