New submission from Joshua Root <josh+pyt...@root.id.au>:

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>.

----------
components: Build
messages: 303098
nosy: jmr
priority: normal
severity: normal
status: open
title: Availability of utimensat and futimens not checked correctly on macOS
type: crash
versions: Python 3.5, Python 3.6

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31601>
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