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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Emacs-26 w64 problem
Date: Sat, 28 Oct 2017 20:34:50 +0300
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To: Fabrice Popineau <fabrice.popineau@gmail.com>
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> From: Fabrice Popineau <fabrice.popineau@gmail.com>
> Date: Sat, 28 Oct 2017 19:28:11 +0200
> 
> I have done 
> make distclean
> make bootstrap
> ../emacs/configure --prefix= ...
> 
> and I had the surprise that somehow, my whole mingw64 directory -- where emacs is meant to be installed --
> has been _erased_ .

By "mingw64 directory" do you mean the directory specified by --prefix?
Or do you mean something else?