[Nix-dev] More Library Trouble (Haskell and Python Libraries)

[Joel Moberg]

 I don't use haskell but I maybe have the answer for Python. I have set
PYTHONPATH=$HOME/.nix-profile/lib/python2.7/site-packages. You may want to
set it to /run/current-system/sw/lib/python2.7/site-packages if you
installed it to the system profile. You can also install
recursive-pth-loader which is required for some packages to be loaded.

On Tue, Oct 20, 2015 at 4:07 AM, Taeer Bar-Yam <tb442 at cornell.edu> wrote:

> Hey guys,
>   I added some haskell and python libraries to my configuration.nix
> environment.systemPackages, and they are appearing in
> /run/current-system/sw/lib/(relevant language)/ But when I try to use them
> from scripts, the programming language can't find them. Is there some way I
> need to tell the compiler/interpreter/language where to look?
>
> Details:
>   Haskell:
> - package is io-memoize (though the problem occurred with other packages
> as well)
> - packages appear in
> /run/current-system/sw/lib/ghc-7.10.2/io-memoize-1.1.1.0/
> - Error message is:
>   Could not find module `System.IO.Memoize'
>   Locations searched:
>     System/IO/Memoize.hs
>     System/IO/Memoize.lhs
>     System/IO/Memoize.hsig
>     System/IO/Memoize.lhsig
> - It is interesting to note that the file that appears in
> /run/current-system/sw/lib/ghc-7.10.2/io-memoize-1.1.1.0/ does not have any
> of those file extensions. It is Memoize.hi.
>   But the standard library is also in .hi format, and those libraries load
> fine.
>
>   Python:
> - numpy, matplotlib
> - seems to be in /run/current-system/sw/lib/python2.7/site-packages
> - Error message:
>   ImportError: No module named numpy
>
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