package haskell-src depending on happy?

Hi! I just tried to install haskell-src with cabal and passed 'runhaskell setup.hs configure' but 'runhaskell setup.hs build' died with "Language\Haskell\Parser.ly: no happy preprocessor available". This looks to me like happy is required for haskell-src, but it is not mentenied in the dependencies. Do I really have to install happy? (In the past that was a nightmare if I remember correctly.) My system is Win2k and ghc-6.1.1. Kind regards Andreas