[xmonad] XMonad.Util.ExtensibleState no found

Hi, I am trying to run a conig file from the xmonad homepage. I get the Error: Could not find module `XMonad.Util.ExtensibleState' googling tells me that the modules should be available in xmonad-contrib 0.9.1 I am on gentoo linux and have xmonad 0.9.1 and xmonad-contrib 0.9.1 Any Ideas? Thanks! Nathan