Your package rubygem-chronic failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7000014 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906015 [details] build.log
Created attachment 906016 [details] root.log
Created attachment 906017 [details] state.log
*** Bug 1107077 has been marked as a duplicate of this bug. ***