As stated in
pkgconfig(foo) is a more reliable marker of what ships the devel files,
than the package name.
It does not matter if the config process uses pkgconfig or not.
Depending on the package name is not a way to state you're not using
pkgconfig, it's a way to get broken builds when the package you depend
on gets restructured.
rpm filename deps are less reliable than rpm font package deps, which
are themselves less reliable than automatically computed virtual deps
--
Nicolas Mailhot