Your package rubygem-haml-rails failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=5769815 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_20_Mass_Rebuild
Resolved by updating to the newest version. Koji: http://koji.fedoraproject.org/koji/taskinfo?taskID=5811194