Yes, I did need that reminder. Memory is failing today. But... does it change my question? GNU gives me a compiler without making me sign up for an "account".
OSX is not BSD, but there's no way it could even think about calling itself "UNIX" and getting certified as such without all the BSD code they took.
What else is OS X? It's a kernel from CMU. And whiz bang graphics. And lots of annoyances.