[Haskell-cafe] How to use lib compat-base3 in ghc 6.10?

Hi, Xmonad needs Data.Generics from base3. And I found out that there is a "compat-base3" in ghc 6.10, which has Data.Generics. But `ghc -v` reports that base-3.0.3.0 is hidden. So I wonder how could I compile Xmonad with ghc 6.10? Thanks.