Hi Aristid,
you should remove ghc-7.4.1-linkdir from your profile altogether and
install haskell-env-ghc-7.4.1 instead. See this commit for details:
| commit 9491d08a9d98f06dfc12bdc89cb2be322947f066
| Author: simons <simons@70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb>
| Date: Wed Mar 21 11:46:15 2012 +0000
|
| pkgs/development/compilers/ghc/with-packages.nix: renamed this expression
from "ghc-${ghc.version}-linkdir" to "haskell-env-${ghc.n
|
| This change allows use of the with-packages wrapper in user profiles that are
| being updated with "nix-env -u \*". The previous name this expression
generated
| was considered by Nix to be an older version of "ghc-7.0.4-wrapper", because
| that name has a higher priority.
|
| git-svn-id: https://nixos.org/repos/nix/nixpkgs/trunk@33325
70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb
Take care,
Peter
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