It's going to take a while for this to shake out, but from what I've seen, SCO has made a monumental mistake. I suspected that the "infringing" code was actually from a common source like BSD, and this appears to establish that.
There's enough evidence for someone to put together a comprehensive article debunking SCO's claims, at least in this particular instance. When I see one, I'll post it.
Clearly SCO didn't do its due diligence before presenting this particular allegation. Do McBride and Boies have a corporate death wish?