Your package rxtx failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=7004571 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
Created attachment 906521 [details] build.log
Created attachment 906522 [details] root.log
Created attachment 906523 [details] state.log