Your package krfb failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=12828719 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild
Created attachment 1125164 [details] build.log
Created attachment 1125165 [details] root.log
Created attachment 1125166 [details] state.log
it's fixed in krfb-15.12.2-2.fc24 http://koji.fedoraproject.org/koji/taskinfo?taskID=13035080