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MacOS is not based on BSD, it's an old legend. NeXTStep was designed to be "compatible" with 4.3BSD (the diagram on Wikipedia is wrong because of this confusion

MacOS is not based on BSD, it's an old legend. NeXTStep was designed to be "compatible" with 4.3BSD (the diagram on Wikipedia is wrong because of this confusion). Edit : source about compatibility on the last page : http://www.nextcomputers.org/NeXTfiles/Docs/Developer/NeXT_Development_Tools.pdf http://www.nextcomputers.org/NeXTfiles/Docs/Developer/NeXT_D...

dralley 6y ago
Many Mac OSX userspace utilities were forked from FreeBSD. It's true that the OS as a whole is not really a FreeBSD derivative, but there definitely is some shared code.
- hyakosm 6y ago
  Yes, many OS forked code from FreeBSD, especially on the network stack.