h@togetic:~/.xmonad$ ghc-pkg list
/usr/lib/ghc-6.6.1/package.conf:
    Cabal-1.1.6.2, base-2.1.1, binary-0.4.1, filepath-1.0, (ghc-6.6.1),
    haskell98-1.0, mtl-1.0.1, parsec-2.0, readline-1.0,
    regex-base-0.72, regex-compat-0.71, regex-posix-0.71, rts-1.0,
    stm-2.0, template-haskell-2.1, unix-2.1
/home/h/.ghc/i386-linux-6.6.1/package.conf:
    Cabal-1.2.3.0, X11-1.2.2, X11-1.4.1, xmonad-0.5