[Haskell-cafe] happstack-helpers fails to install on Mac OSX

[Colin Paul Adams]

I've just installed the Haskell Platform (2009.2.0.2) on Mac OSX
10.5.6, including GHC 6.10.4.

Then I started added some packahges with cabal install.

But happstack-helpers-0.30 fails with:

Happstack/Helpers/DirBrowse.hs:88:105
   Couldn't match expected type `String' against inferred type `Bool'
   In the third argument of `hscolour', namely `False'
   In the second argument of `(.)', namely
       `BrowseHtmlString . (hscolour defaultColourPrefs False False f)'

Is this a known error, and if so, is there a workaround?
-- 
Colin Adams
Preston Lancashire