Martin Panter added the comment:

Unfortunately, yes I think another test might be needed in configure.ac, unless 
you can piggy-back on one of the existing flags.

One more thing that I thought of: Looking at the main Python signal handler, it 
reinstalls itself, see 
<https://hg.python.org/cpython/file/v3.5.1/Modules/signalmodule.c#l306>. This 
is apparently because handlers installed by Posix signal() might be only called 
once. But if the handler was installed by sigaction(), it should not be 
reinstalled. Should our SIGWINCH handler do something similar?

----------
versions: +Python 3.6 -Python 3.4

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<http://bugs.python.org/issue23735>
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