This is _probably_ unrelated, but i saw a very similar behaviour in the
Google v8 source tree when building on Mint Linux a year or so ago (IIRC,
Mint is related to Cent?). The problem only arose on that platform, and i
assume it was a bug in one of the core tools they had shipped, but i cannot
speculate what that might have been. It was darned weird. David's
suggestion/hypotheses sounds as good as any to me
Actually CentOS is the consumer version of RHEL; from what I understand you go with CentOS if you want a RHEL box but can't afford the enterprise price tag. But I'll search for issues like the one you mentioned for CentOS 5.9...maybe there's a similar bug.
If anyone else has any suggestions or theories, please feel free to chime in.