Your package tnef failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7010601 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906948 [details] build.log
Created attachment 906949 [details] root.log
Created attachment 906950 [details] state.log
Cause is -Werror=format-security in bug 1037361.