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The history of this code is interesting.
zlib 0.71 (the first version in git) had:
zlib 1.0.8 added the fdopen thing, but differently:
The corresponding changelog:
zlib 1.1.3 changed it to:
I think the corresponding changelog entry is:
Presumably, Metrowerks was defining TARGET_OS_MAC, and probably didn't define TARGET_OS_OSX, so my assumption here is that this change breaks Metrowerks. However, it's also a long gone compiler, so maybe this part can go entirely, which leaves us with two different OS_CODE values for macOS, one of which was added in ce12c5c