title: NixOS and ghc-mod - Module not found
body: <p>I'm experimenting a problem with the interaction between the ghc-mod plugin in emacs, and NixOS 14.04. Basically, once packages are installed via <code>nix-env -i</code>, they are visible from ghc and ghci, recognised by haskell-mode, but not found by ghc-mod.</p>
  
  <p>To avoid information duplication, you can find all details, and the exact replication of the problem in a VM, in the bug ticket <a href="https://github.com/kazu-yamamoto/ghc-mod/issues/269">https://github.com/kazu-yamamoto/ghc-mod/issues/269</a></p>