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 <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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