bug#28601: 26.0.50; configure: error: Emacs does not support 'x86_64-pc-msys' systems.

[Noam Postavsky <npostavs@users.sourceforge.net>]

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On Fri, Sep 29, 2017 at 5:37 AM, Eli Zaretskii <eliz@gnu.org> wrote:

>> > Vincent Belaďche wrote:
>> >
>> >> There is no such thing as a mingw64_shell.bat script, but there is a
>> >> msys2_shell.cmd script, which one can launch with the -mingw64 for
>> >> MSYSTEM to be set accordingly to MSYSTEM=MINGW64.

> Can you or someone else suggest a change for INSTALL.W64, if some
> change is needed there?

The attached should do it.

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From fc6083a57cea4f9dff3c865f2185902c337d4cf5 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 12 Oct 2017 19:01:37 -0400
Subject: [PATCH] * nt/INSTALL.W64: Use mingw64.exe instead of
 mingw64_shell.bat.

---
 nt/INSTALL.W64 | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/nt/INSTALL.W64 b/nt/INSTALL.W64
index 841660b..c651a21 100644
--- a/nt/INSTALL.W64
+++ b/nt/INSTALL.W64
@@ -125,8 +125,9 @@ put the Emacs source into C:\emacs\emacs-25:
 Now you're ready to build and install Emacs with autogen, configure, make,
 and make install.
 
-First we need to switch to the MinGW-w64 environment.  Exit the MSYS2 BASH
-console and run mingw64_shell.bat in the C:\msys64 folder, then cd back to
+First we need to switch to the MinGW-w64 environment.  Exit the MSYS2
+BASH console and run mingw64.exe in the C:\msys64 folder (if it's
+missing, install it with 'pacman -S msys2-launcher'), then cd back to
 your Emacs source directory, e.g.:
 
   cd /c/emacs/emacs-25
-- 
2.6.2.windows.1