Ned Deily <n...@python.org> added the comment:

Thanks for your suggested patch and my apologies for not replying sooner.  For 
Python 2.7.15, we have done some housecleaning of old macOS support issues and, 
as part of ee8e4b61d6181f5bfadf6ee3d229f0ebda8a6ae9 for Issue32726, I have 
backported the deployment target setting behavior from 3.x, i.e. the deployment 
target on current systems is now set to the build system's OS level unless 
overridden by MACOSX_DEPLOYMENT_TARGET= on the configure command or as an 
environment variable.  So the previous behavior can be forced by:

./configure MACOSX_DEPLOYMENT_TARGET=10.4

As you noted, using a proper value for the deployment target allows things like 
using the system libedit readline support and standard library support for more 
recent system calls.

----------
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
title: MACOSX_DEPLOYMENT_TARGET set incorrectly by configure -> 
MACOSX_DEPLOYMENT_TARGET set incorrectly by configure in Python 2.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue24414>
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