Your package scilab failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17791314 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1254540 [details] build.log
Created attachment 1254541 [details] root.log
Created attachment 1254542 [details] state.log
davidcl's scilab-6.0.0-1.fc26 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=860800
Fixed in the current rawhide