default.nix

let
    pkgs = import (builtins.fetchTarball {
        url = "https://github.com/NixOS/nixpkgs/archive/1a88aa9e0cd.tar.gz";
        sha256 = "076zlppa0insiv9wklk4h45m7frq1vfs43vsa11l8bm5i5qxzk6r";
    }) { };
    hsOverrides = haskellPackagesNew: haskellPackagesOld: {
        julio = haskellPackagesNew.callPackage ./julio.nix { };
        rank1dynamic = haskellPackagesNew.callPackage ./rank1dynamic-0.4.0.nix { };
        distributed-process = haskellPackagesNew.callPackage ./distributed-process-0.7.4.nix { };
        containers = haskellPackagesNew.callPackage ./containers-0.5.11.0.nix { };
        distributed-static = haskellPackagesNew.callPackage ./distributed-static-0.3.8.nix { };
        parallel-julia = pkgs.haskell.lib.addExtraLibrary (haskellPackagesNew.callPackage ./pkg.nix {}) pkgs.libuv;
    };
in
  pkgs.haskell.packages.ghc844.override { overrides = hsOverrides; }