[Nix-dev] Conflict between ghc-7.4.1-linkdir and haskell-env-ghc-7.4.1

[Aristid Breitkreuz]

It seems like changing the priorities broke some things. Now, when I try to
change the package list that is installed with ghcWithPackages, I get this
error:

$ sudo nix-env -iA nixpkgs_unstable.ghc741Packages
replacing old `haskell-env-ghc-7.4.1'
installing `haskell-env-ghc-7.4.1'
error: attribute `mtl' missing
(use `--show-trace' to show detailed location information)


I have copied the output of the command with --show-trace, as well as the
contents of my config.nix to a Gist: https://gist.github.com/2254799

What is going on? I don't understand! :)


Aristid


Am 30. März 2012 22:03 schrieb Aristid Breitkreuz <aristidb at googlemail.com>:

> Hi Nix list,
>
> I use haskellPackages_ghc741.ghcWithPackage to install my GHC (as Andres
> Löh explained to me), and had a conflict between ghc-7.4.1-linkdir and
> haskell-env-ghc-7.4.1 when trying to add a new package to the configuration
> of ghcWithPackage:
>
> Collission between
> `/nix/store/ifjid0cil62kh5z6dbqh0vwag61j1hng-haskell-env-ghc-7.4.1/bin/cpphs'
> and
> `/nix/store/g045kraz73m00c56a76i4zff5phg6i1i-ghc-7.4.1-linkdir/bin/cpphs'.
> Suggested solution: use `nix-env --set-flag priority NUMBER PKGNAME' to
> change the priority of one of the conflicting packages.
>
>
> I could successfully resolve this by giving haskell-env-ghc-7.4.1 a lower
> (winning) priority, but I also noticed that the two cpphs binaries were
> exactly the same. Is this supposed to be this way?
>
>
> Thanks,
>
> Aristid
>
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