[Nix-dev] patch: add haskell package for darcs version of cabal-install

[Andres Loeh]

Hi Peter.

> I tried to build the latest version of cabal-install using that patch,
> but the build failed with the following error message:
>
>  | Configuring cabal-install-0.15.0...
>  | Setup: At least the following dependencies are missing:
>  | Cabal >=1.15.0 && <1.16

There's a 1.14 release branch that works with Cabal-1.14, but ...

> Now, Cabal version 1.15.0 is not public available, i.e. we would have to
> have build that library from the Darcs repository, too, to make that
> available. I'm not sure whether we should go into that direction, though.

... I agree. It's not worth the effort. cabal-install-1.14 is going to
be released really soon now. We've been able to live with this
situation for months, so we'll manage for a week or two more.

> The problem is that, right now, GHC 7.4.1 cannot build cabal-install. Since
> cabal-install is an executable without any library code, it doesn't matter,
> though, which compiler has built it: one can use, say
>
>  haskellPackages_ghc704.cabalInstall
>
> ..., just fine with GHC 7.4.1. It's certainly not a good solution, though,
> because users who are new to Nix won't be able to guess that.
>
> Well, I'm not sure what to do. Opinions, anyone?

Leave it as is until the new cabal-install is released.

Cheers,
  Andres