Your package gtk-v4l failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=6980833 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 905164 [details] build.log
Created attachment 905165 [details] root.log
Created attachment 905166 [details] state.log
Cause is bug 1037113; will propose patch there.