Having pygtk2-devel and gstreamer-devel as runtime requirements for gstreamer-python causes fedora-rmdevelrpms to fail. The proper way to fix this is to of course split off a -devel package.
Hm. fedora-rmdevelrpms is a really bad program anyway, it's doing something people shouldn't be doing. To be honest, I see no reason yet to split off a -devel package because not much is in it. Some other packages do the same thing. You should consider using something other than fedora-develrpms, like a proper build program that builds in its own root instead of your system.
no reply, closing.