OSx is heavily influenced, and I believe still gets their POSIX compliance (that might have changed)
I could not have said that much clearer or better.
The only thing I would clear up is that OS X .... is .... UNIX 03 Certified.... POSIX is a rather easy standard to say you're compliant with, I believe even Windows can.
UNIX 03
The only reason why Linux can't/won't get certified is the process takes money.... and they don't need it.
Even IBM's newest large "server hardware" is pushing people away from using AIX (IBM's UNIX) and pushing towards using Linux as the preferred operating system on it.
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