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