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 <[email protected]> On Behalf Of Shao, Cheng
Sent: 26 March 2018 10:59
To: [email protected]
Subject: Re: Windows

Hi Simon,

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".

On Mon, Mar 26, 2018 at 5:46 PM, Simon Peyton Jones via ghc-devs 
<[email protected]<mailto:[email protected]>> 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 
<[email protected]<mailto:[email protected]>> On Behalf 
Of Ben Gamari
|  Sent: 24 March 2018 16:42
|  To: Gabor Greif <[email protected]<mailto:[email protected]>>; 
[email protected]<mailto:[email protected]>
|  Cc: [email protected]<mailto:[email protected]>
|  Subject: Re: Windows
|
|  Gabor Greif <[email protected]<mailto:[email protected]>> writes:
|
|  > Just an idea...
|  >
|  > could this hint be part of the `configure` error message?
|  >
|  Indeed. See D4526.
|
|  Cheers,
|
|  - Ben
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