There were theese lines in the end of ghc-pkg output log:

 The following packages are broken, either because they have a problem
listed above, or because they depend on a broken package.
pipes-core-0.1.0
pipes-core-0.1.0

And yes, I tried to load Control.Pipes in ghci. It worked not.

Now I solved this problem with manual `categories` install. I suppose, you
haven't noticed any problems, so the question is partly closed (I have to
do pull request to nixpkgs with appropriate patch)

2012/8/15 Andres Loeh <[email protected]>

> Thanks, haven't tried it yet, but ...
>
> > 7. nixpkgs$ ghc-pkg check
>
> ... the output of "ghc-pkg check" for the wrapped GHC is possibly a
> bit suspicious. Have you tried
>
> $ ghci -package pipes-core
>
> $ ghci -package categories
>
> Do these work or not?
>
> Cheers,
>   Andres
>
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