{ pkgs ? import <nixpks>
}:
with pkgs;
let
    pkgs = import (builtins.fetchTarball {
        url = "https://github.com/NixOS/nixpkgs/archive/2935a67eb946a208b1da7a453d125bc188fd9c33.tar.gz";
    }) { };
    hsOverrides = haskellPackagesNew: haskellPackagesOld: {
        julio = haskellPackagesNew.callPackage ./julio.nix { };
        distributed-process = haskellPackagesNew.callPackage ./distributed-process-0.7.4.nix { };
        parallel-julia = pkgs.haskell.lib.addExtraLibrary (haskellPackagesNew.callPackage ./pkg.nix { inherit julia; }) pkgs.libuv;
    };
    julia = pkgs.julia_11;
in
  pkgs.haskell.packages.ghc844.override { overrides = hsOverrides; }