[xmonad] XMonad.Util.ExtensibleState no found

[Nathan Huesken]

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