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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: build failures in mingw64
Date: Sun, 09 Jul 2023 14:22:21 +0300
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In-Reply-To: <1875090786.3640353.1688896916667@mail1.libero.it> (message from
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> Date: Sun, 9 Jul 2023 12:01:56 +0200 (CEST)
> From: Angelo Graziosi <angelo.g0@libero.it>
> Cc: emacs-devel@gnu.org
> 
> i.e. it prints that message if the variable is undefined and not quoted..

Yes, it should be quoted.  That's the bug.