let
  config = {
    packageOverrides = pkgs: rec {
      haskell = pkgs.haskell // {
        packages = pkgs.haskell.packages // {
          ghcjs84 = pkgs.haskell.packages.ghcjs84.override {
            overrides = haskellPackagesNew: haskellPackagesOld: rec {
              primitive = haskellPackagesNew.callPackage ./primitive.nix { };
            };
          };
        };
      };
    };
  };

  pkgs = import <nixpkgs> { inherit config; };

in pkgs.haskell.packages.ghcjs84.callPackage ./client.nix {};