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{
  # a common build function
  #
  # see example usage in pack/ibb.nix. this is not set in stone, obviously. we
  # should figure out how to use overlays, for one.
  #
  bild = file: { nixpkgs }:
    with nixpkgs;
    let
      pack = import file;

      depsToPackageSet = packageSet: deps:
        map (s: builtins.getAttr s packageSet) deps;

      ghc = pkgs.haskell.packages.ghc844.ghcWithPackages (hp:
        # we need hinotify for chip/make
        depsToPackageSet hp
          ([ "hinotify" ] ++ pack.deps.both ++ pack.deps.apex));

      ghcjs_ = pkgs.haskell.packages.ghcjs.override (oldAttrs: {
        overrides = with pkgs.haskell.lib; self: super: {
          http-types = dontCheck super.http-types;
          tasty-quickcheck = dontCheck super.tasty-quickcheck;
          scientific = dontCheck super.scientific; # takes forever
          servant = dontCheck super.servant;
          comonad = dontCheck super.comonad;
          QuickCheck = dontCheck super.QuickCheck;
        };
      });

      ghcjs = ghcjs_.ghcWithPackages (hp:
        depsToPackageSet hp (pack.deps.both ++ pack.deps.aero));

      make = ../chip/make;
    in
    stdenv.mkDerivation {
      name = pack.name;
      version = "0";
      src = ../.;
      nativeBuildInputs = [
        ghc ghcjs
      ];
      strictDeps = true;
      buildPhase = "${ghc}/bin/runhaskell ${make} ${pack.name}";
      installPhase = ''
        mkdir -p $out/bin
        cp bild/${pack.name} $out/bin/${pack.name}
      '';
    };
}