let
  pkgs = import <nixpkgs> {};
  sdcc_ = (pkgs.sdcc.override {
    inherit (pkgs) gputils;
    excludePorts = ["mcs51" "z80" "z180" "r2k" "r3ka" "gbz80" "tlcs90" "ds390" "ds400" "pic16" "hc08" "s08" "stm8"];
  }).overrideAttrs (o: {
    enableParallelBuilding = true;
  });
in
with pkgs;
stdenv.mkDerivation {
  name = "blink";
  buildInputs = [ sdcc_ gputils ];
  src = ./.;
  installPhase = ''
    mkdir $out
    cp blink_led.hex $_
  '';
}