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

Brent Yorgey byorgey at seas.upenn.edu
Thu Aug 25 18:17:55 CEST 2011

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.


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