Message 303098 - Python tracker

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Content 
The futimens and utimensat functions are available in High Sierra but not previous versions of macOS. Building against the 10.13 SDK and deploying to an earlier version will result in a crash when the dynamic linker can't find the symbols at runtime. Availability of the symbols needs to be checked at runtime before use.

This was originally reported in <https://trac.macports.org/ticket/54893>.