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Document GHCUP_MSYS2, fixes #427

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Julian Ospald 2022-12-19 00:52:11 +08:00
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@ -97,6 +97,10 @@ This is the complete list of env variables that change GHCup behavior:
* `GHCUP_SKIP_UPDATE_CHECK`: Skip the (possibly annoying) update check when you run a command
* `CC`/`LD` etc.: full environment is passed to the build system when compiling GHC via GHCup
On windows, there's additionally:
* `GHCUP_MSYS2`: Has to point to the root of an existing MSYS2 installation (when installed by GHCup, that's e.g. `C:\ghcup\msys64`). GHCup bootstrap takes care of this usually.
### XDG support
To enable XDG style directories, set the environment variable `GHCUP_USE_XDG_DIRS` to anything.