@thomasfuchs how much "actual" Unix code is contained in MacOS is arguable, but yes recent versions are technically a true UNIX and certified, while OSX originally wasn't certified and had a ton of incompatibilities to the SUS spec.
This is explained rather well here: https://www.quora.com/What-goes-into-making-an-OS-to-be-Unix-compliant-certified
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mxk (mxk@hachyderm.io)'s status on Tuesday, 15-Aug-2023 16:28:50 JST mxk