Description of problem: Fedora's Posgresql upgrade is broken when user use extensions cf. #1055293. Unfortunately, pg_config and includes are not installed in /usr/lib64/pgsql/postgresql-X.Y/bin and /usr/lib64/pgsql/postgresql-X.Y/includes, thus it is (nearly) impossible to compile an extension like Postgis.
*** This bug has been marked as a duplicate of bug 1475177 ***