Your package postgis failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17782616 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1253613 [details] build.log
Created attachment 1253614 [details] root.log
Created attachment 1253615 [details] state.log
Apparently another victim of RHBZ#1417385. A scratch-build with an unmodified spec finishes fine, now. I am going to launch a real build.
corsepiu's postgis-2.3.2-2.fc26 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=853374
https://koji.fedoraproject.org/koji/taskinfo?taskID=17928435