Yup. This is the MSYSTEM env. variable which determines 'uname' output for client, see: http://www.haskell.org/pipermail/ghc-devs/2013-October/002920.html.

Cheers,
Kyra

On 8/29/2014 20:22, Páli Gábor János wrote:
2014-08-29 17:59 GMT+02:00 kyra <[email protected]>:
it's extremely
important to remember you must *not* use msys2_shell.bat to start MSYS2
shell, only mingwXX_shell.bat (XX stands for 32 or 64) shall be used to
start MSYS2 shell -- otherwise GHC make system would not recognize build
triplet.
For what it is worth -- to my experience --, one could build GHC
successfully on Windows without using mingwXX_shell.bat.  Only the
MSYSTEM environment variable has to be set properly (to either MINGW32
or MINGW64).  That is what mingwXX_shell.bat also does.
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