Re: MinGW build on master fails with Error 127

[Eli Zaretskii]

> From: Óscar Fuentes <ofv@wanadoo.es>
> Cc: helohe@bluewin.ch,  emacs-devel@gnu.org
> Date: Sat, 24 Dec 2022 17:14:56 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Please note that MinGW-w64 and MSYS2 (which includes MINGW-packages) are
> >> different projects. MSYS2 builds, packages and distributes MinGW-w64.
> >> MSYS2 decided to bump _WIN32_WINNT in our build scripts, which has
> >> implications for Emacs (see below) but that's independent of what
> >> MinGW-w64 actually, officially supports.
> >
> > So what are the details?  Which versions of Windows does MSYS2
> > support, 
> 
> Since about 1 week ago, the minimum requirement is Windows 8.1. Hardware
> requirements were also recently upgraded. A CPU from 2007 onwards should
> be fine:
> 
> https://www.msys2.org/news/#2022-10-18-new-minimum-hardware-requirements-cpus-from-20067

And the MinGW64 folks now informed me that MinGW64 switched to
Windows 10 as the default target about a year ago.  See

  https://github.com/msys2/MINGW-packages/issues/14573#issuecomment-1364569522

Which in practice means building with MinGW64 on versions of
MS-Windows older than 10 is no longer safe ore recommended.

I updated the installation instructions and PROBLEMS to that effect.