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Changes between Initial Version and Version 1 of Ticket #66953, comment 5

initial	v1
1		Ok. Cross-OS-version compilation is prone to problems like this. However, it [https://gitlab.kitware.com/cmake/cmake/-/issues/20054#note_663424 sounds like this is supposed to work], so it may be a simple bug that can be fixed.
	1	Ok. Cross-OS-version compilation is prone to problems like this. However, it [https://gitlab.kitware.com/cmake/cmake/-/issues/20054#note_663424 sounds like this is supposed to work] (or at least was supposed to work 3 years ago), so it may be a simple bug that can be fixed.
2	2
3	3	The cmake port requires a C++14 compiler but will use features from C++17 (like "optional") if they are detected to work. It sounds like maybe something has gone wrong with the detection, and it has perhaps determined that "optional" is available on the basis of your Big Sur / Ventura libc++ when it needs to be looking at the Sierra libc++ in the 10.12 SDK that doesn't support it.