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@brouhaha @thomasfuchs this. It is certified Unix compatible and it at different points incorporated code from NetBSD and FreeBSD, but XNU/Darwin Trace no direct history to the AT&T Unix/System V, so calling it a "true" Unix is misleading.
And in a world where the true Unixes all are dead, the value of this certification is really questionable. I would argue, that POSIX nowadays is what counts, and certified UNIX is purely a gimmick.