Description of problem: Source package cfitsio-3.360-1 used by EPEL7 does not support ppc64le. A newer version supporting this architecture should be used instead.
This is embarrassing, but I forgot to push the ppc64le commits. Since June last year. It's building right now http://koji.fedoraproject.org/koji/taskinfo?taskID=9138087
cfitsio-3.370-1 builds ok now on my epel7 ppc64le local environment