package haskell-src depending on happy?

Simon Marlow simonmarhaskell at
Wed May 30 06:00:49 EDT 2007

Andreas Marth wrote:

> I just tried to install haskell-src with cabal and passed 'runhaskell
> setup.hs configure' but 'runhaskell setup.hs build' died with
> "Language\Haskell\ no happy preprocessor available".
> This looks to me like happy is required for haskell-src, but it is not
> mentenied in the dependencies.

Yes haskell-src does require happy, dependencies only mention libraries which is 
why you don't see it there.

> 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.

Happy should be easy to install on Windows.  There's a binary zip file you can 
unpack anywhere you like, or you can build from source using Cabal.


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