Created attachment 3852 Trivial patch to port xfce4-weather-plugin to libxfce4ui. Only that. Attached a trivial patch to port xfce4-weather-plugin to libxfce4ui. Regards.
Fixed in http://git.xfce.org/panel-plugins/xfce4-weather-plugin/commit/?id=d776b317fd3b6523490ecc2159d693485d69c01c. Thanks for your patch.