These installers don't attempt to uninstall prior versions, and depending on

how your prior versions were installed, they may, or may not, happily co-exist

with this installation. I'm interested to hear experience reports of trying

these installers both systems both with and without prior Haskell setups.

You can probably erase most (all?) traces of a prior Haskell install with this

procedure:

  sudo rm -rf /Library/Frameworks/GHC.framework

  sudo rm -rf /Library/Frameworks/HaskellPlatform.framework

  sudo rm -rf /Library/Haskell

  rm -rf .cabal

  rm -rf .ghc

  rm -rf ~/Library/Haskell

  find /usr/bin /usr/local/bin -type l | \

    xargs -If sh -c '/bin/echo -n f /; readlink f' | \

    egrep '//Library/(Haskell|Frameworks/(GHC|HaskellPlatform).framework)' | \

    cut -f 1 -d ' ' > /tmp/hs-bin-links

  # review /tmp/hs-links

  sudo rm `cat /tmp/hs-bin-links`