Your package rubygem-climate_control failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7000072 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906021 [details] build.log
Created attachment 906022 [details] root.log
Created attachment 906023 [details] state.log
The failure was due to a bug in simplecov (bug 1083715) rubygem-climate_control-0.0.3-5 contains a patch to make simplecov optional. F21 build: http://koji.fedoraproject.org/koji/taskinfo?taskID=7037753