If the build environment is managed by an MSYS2 installation, then the MinGW64 shell startup script automatically sets up "MSYSTEM" for you. It can be launched like "C:\msys64\msys2_shell.cmd -mingw64 -mintty".

Well I just followed the Method A instructions at

https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows

Are you saying that I should run “C:\msys64\msys2_shell.cmd -mingw64 -mintty" just once, after installing? Or repeatedly? Or that I should somehow us it as my main shell? And what does that commend actually do?

Sorry to be dense

Simon

From: ghc-devs <ghc-devs-bounces@haskell.org> On Behalf Of Shao, Cheng
Sent: 26 March 2018 10:59
To: ghc-devs@haskell.org
Subject: Re: Windows

Hi Simon,

On Mon, Mar 26, 2018 at 5:46 PM, Simon Peyton Jones via ghc-devs <ghc-devs@haskell.org> wrote:

Making it part of the error message would be v helpful.

I have added a section to "Troubleshooting" on
https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows

But it should really be part of the instructions higher up to sa
export MSYSTEM=MINGW64

Might someone do that? I wasn't quite sure where

Simon

| -----Original Message-----
| From: ghc-devs <ghc-devs-bounces@haskell.org> On Behalf Of Ben Gamari
| Sent: 24 March 2018 16:42
| To: Gabor Greif <ggreif@gmail.com>; lonetiger@gmail.com
| Cc: ghc-devs@haskell.org
| Subject: Re: Windows
|
| Gabor Greif <ggreif@gmail.com> writes:
|
| > Just an idea...
| >
| > could this hint be part of the `configure` error message?
| >
| Indeed. See D4526.
|
| Cheers,
|
| - Ben

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