[Haskell-cafe] Strange error when cabal installing.

After installing the *Haskell Platform* on my Windows 10 machine, I attempted to cabal install something and got: cabal.exe: The package has a './configure' script. If you are on Windows, This requires a Unix compatibility toolchain such as MinGW+MSYS or Cygwin. If you are not on Windows, ensure that an 'sh' command is discoverable in your path. I've confirmed that the following line is in my cabal config file: extra-prog-path: C:\Program Files\Haskell Platform\8.6.5\msys\usr\bin, C:\Users\capnf\AppData\Roaming\cabal\bin and that there *is* a *sh.exe* file in the "C:\Program Files\Haskell Platform\8.6.5\msys\usr\bin" directory. What am I missing? Thanks, -db