Your package xerces-c27 failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17794196 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1254924 [details] build.log
Created attachment 1254925 [details] root.log
Created attachment 1254926 [details] state.log
Taking. The cause of this FTBFS is this spec using perl, but perl not being in buildroots by default anymore. As the only perl invocation in this package is a regex-one-liner inside of this spec and sed is being used elsewhere, I am going to replace the perl use-case with an equivalent sed one-liner.
https://koji.fedoraproject.org/koji/buildinfo?buildID=861678