Hey! Thanks to all for the answers... i didn't know about ghc 7.2. I uninstalled ghc and reinstalled using homebrew (mac package manager). Now I have: The Glorious Glasgow Haskell Compilation System, version 7.0.4 cabal is: /usr/bin ➜ cabal --version cabal-install version 0.10.2 using version 1.10.2.0 of the Cabal library And now, I was able to install MissingH, but still can't make EclipseFP work correctly :S When i start EclipseFP, it tries to build the scion-browser, but it fails inmediately with a message from cabal: cabal: The program ghc version >=6.4 is required but it could not be found. Google wasn't much help. Is anybody using EclipseFP? I've installed version 2.1 in eclipse indigo. I'm a regular eclipse user, but with haskell i'm lost. Best, Mariano * *