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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Building latest on Windows: error in unistd.h
Date: Wed, 22 Sep 2021 20:38:28 +0300
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In-Reply-To: <834kacwm5g.fsf@gnu.org> (message from Eli Zaretskii on Wed, 22
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> Date: Wed, 22 Sep 2021 20:33:15 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> How come lib/unistd.h is at all generated and used in your MinGW
> build?  It isn't supposed to be, we use unistd.h that comes with
> MinGW.

nt/gnulib-cfg.mk has this:

  OMIT_GNULIB_MODULE_unistd = true

which should force Gnulib not to generate the unistd.h header.  Why
doesn't it work for you?