Your package xfce4-modemlights-plugin failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7004580 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906524 [details] build.log
Created attachment 906525 [details] root.log
Created attachment 906526 [details] state.log
Cause is bug 1037394 (-Werror=format-security)