To be more specific, darwin was originally based on BSD4.4-lite2 and FreeBSD wit... | Hacker News

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		darkr on March 30, 2016 \| parent \| context \| favorite \| on: Microsoft and Canonical partner to bring Ubuntu to... To be more specific, darwin was originally based on BSD4.4-lite2 and FreeBSD with the Mach hybrid microkernel. It has diverged significantly since with lots of new APIs in userland, but all major BSD apis are still there - it is still a POSIX compliant system

gsnedders on March 30, 2016 [–]

NeXTSTEP originally used 4.3BSD-Tahoe as its base with Mach, and Darwin's a direct descendent of that.

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