So far - for the things I _need_ from Fedora Extras - I've been pretty
succesful at just rebuilding the src.rpm in fc3 and installing the
result of that. One package I had to up the version to current (fc2
version wouldn't build w/ gcc34) but other than that -
rpmbuild --rebuild package.src.rpm
has pretty much just worked. I suspect for most of the packages, they
can install without rebuilding w/o any dependency issues.