Among "Unix-like operating systems", Wikipedia lists #SerenityOS (yay!), but fails to mention GNU.
https://en.wikipedia.org/wiki/List_of_Unix_systems
(one is only left to assume this is because GNU's not Unix...)
@bugaevc Aren't at least AIX, macOS/Darwin and HP/UX (probably Tru64 too) POSIX-certified? That should make them true unices, not UNIX-likes 🤔
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