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Re:Hacker's Guide to Setting Up Your Mac by TickleSteve on Friday October 03, 2014 @08:06AM (#8405128)
Oh dear... Its not even BSD-based... Its Mach based(http://en.wikipedia.org/wiki/Mach_(kernel)) with a BSD userland. (Read BSD-API). So its "BSD-based" in the same way as Windows is Posix-based (as it too can have a Posix userland API).

Linux != UNIX. BSD != OSX

Re:Hacker's Guide to Setting Up Your Mac by bdash on Friday October 03, 2014 @02:33PM (#8406880)
The kernel is actually a hybrid of Mach and FreeBSD. See http://en.wikipedia.org/wiki/XNU for details.