[Haskell-cafe] haskell-src-exts should depend on happy

Niklas Broberg niklas.broberg at gmail.com
Sun Aug 28 22:42:27 CEST 2011

On Thu, Aug 25, 2011 at 6:17 PM, Brent Yorgey <byorgey at seas.upenn.edu>wrote:

> On Thu, Aug 25, 2011 at 04:47:30PM +0100, Ozgur Akgun wrote:
> > Hi,
> >
> > cabal installing haskell-src-exts fails, because of an unlisted
> dependency
> > to the happy executable.
> It does list a dependency on happy:
>    Build-Tools:          happy >= 1.17
> If I understand correctly, the problem is that cabal does not track
> packages which only install executables.  So all it can do is give an
> error if a 'happy' executable is not found; there is no way to have it
> automatically install happy if it is not.  This is a well-known
> limitation of cabal-install rather than a problem with the
>  haskell-src-exts package in particular.

Yep, what Brent said. See this ticket:


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