I had to check out the latest sources from svn and copy it into uppsrc (it expected some modules not present in the source tarball). After I did that it went smooth as silk!
Thanks for all your assistance! I'm on my way to having a dev environment that isn't saddled with all that virally licensed junk.
Now I just need to get used to the ide's organization (I'm a hardcore CodeWarrior guy, so TheIDE feels fairly alien at the moment), and also get llvm/clang working as the compiler (I know... probably very non-trivial)!