just to double check - so you do not help it in any way whatsoever??
what's your command line?
rebuilds for me fail on check-rpaths, specifically:
0x0020 ... an RPATH references '..' of an absolute path; this will break.....
only way I can get it through is actually to follow check-rpaths's advice,
and my env is plain-vanilla, so I'd like to think, I've checked I think everything I could think of, and I've tried scientific and Oracle,
version I'm trying to rebuild is gcc-4.6.2-1.fc16.src.rpm (but also gcc-4.4.5-6.el6.src.rpm)
I'm at loss for ways to troubleshoot it, at least tonight, I'll give it another bash tomorrow