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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: MinGW build broken with O_CLOEXEC undeclared
Date: Sun, 08 Mar 2020 17:11:22 +0200
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To: Paul Eggert <eggert@cs.ucla.edu>
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 Paul Eggert on Sun, 8 Mar 2020 03:08:05 -0700)
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> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Sun, 8 Mar 2020 03:08:05 -0700
> Cc: emacs-devel <emacs-devel@gnu.org>
> 
> >> If not, why is the MinGW port compiling open.c now?
> > 
> > How would I find out?
> 
> Find out why the 'configure' script is executing 'REPLACE_OPEN=1' now, when it 
> didn't do it before that commit. You may need to put some debugging commands 
> into it, e.g., 'echo "got to here" >>/tmp/log'.

lib/open.c is not supposed to be compiled in the MinGW build.