Your package poco failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17782502 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1253601 [details] build.log
Created attachment 1253602 [details] root.log
Created attachment 1253603 [details] state.log
swt2c's poco-1.7.7-2.fc26 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=860284