Your package rubygem-timers failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7004311 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906502 [details] build.log
Created attachment 906503 [details] root.log
Created attachment 906504 [details] state.log
Cause is bug 1068980 (rubygem-timers >= 2.0.0 requires rubygem-hitimes).
This bug appears to have been reported against 'rawhide' during the Fedora 22 development cycle. Changing version to '22'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora22