<p>MacOS seems to be the only one that specifies sys/errno.h in documentation.<br>
But if that were necessary then I suspect sys/errno.h would be found in more places in the codebase.<br>
Even in the MacOS dir there are plenty of plain errno.h's.<br>
Plain errno.h is POSIX.<br>
I'm pretty certain it's normal for errno.h to #include sys/errno.h.</p>

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