Apple macOS 15 Sequoia has been officially recognized as a UNIX variant by the Open Group. This status is more about meeting POSIX compatibility specifications rather than using original AT&T Unix source code. The core of macOS is based on the Mach kernel and BSD-derived userland, making it Unix-like in behavior and compatibility. Despite the certification, POSIX compliance and the importance of Unix certification have diminished over time.

6m read timeFrom theregister.com
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