Try compliling it from source, it's actually a rather painless install.
Just download the .tar.gz
Code:
$ tar xzvf gimp-2.0.5.tar.gz
It will come with some sort of documentation about how to install, read and you'll be ready to rock and roll!
Also, I don't know how well MDK will work with other distro's RPMs, but RPMs for both Fedora and SuSe are on Gimp's
Download page. Nonetheless, don't be afraid to compile something from source, it's really (for the most part) not that difficult, just different.