I have changed the way we create the (non-define by upstream) soname of libcfitsio. The new soname is libcfitsio.so.%{version} (libcfitsio.so.3.330 in this case). A lot of packages check the existance of libcfitsio.so (instead of using the pkg-config file cfitsio provides), Changing the name to libcfitsio-%{version}.so would require to patch those packages also.