Hey, I built KDE 4 overnight on my new Mandriva system, and while most of the pain was just in getting all the various -devel packages installed that I required for building, it seems that once those dependencies have been taken care of, everything went swimmingly. The only two things worth mentioning is that Captury/Capseo stuff doesn't have packages on Mandriva, but they build from sources well enough. Additionally, I have had to built qt-copy and shared-mime-info as part of my KDE 4 build user's installation since it was having trouble picking up those two from the system packages.