{ pkgs ? import <nixpkgs> { }, }:
let
  cc = pkgs.pkgsCross.arm-embedded.stdenv.cc;
  tattlekey = { lib, stdenv, cmake, pico-sdk, python3 }:
    stdenv.mkDerivation {
      pname = "tattlekey";
      version = "0.0.1";
      src = lib.cleanSource ./.;
      nativeBuildInputs = [ cmake python3 ];
      cmakeFlags = [
        "-DCMAKE_C_COMPILER=${cc}/bin/arm-none-eabi-cc"
        "-DCMAKE_CXX_COMPILER=${cc}/bin/arm-none-eabi-c++"
        "-DPICO_BOARD=pico_w"
        "-DPICO_SDK_PATH=${pico-sdk}/lib/pico-sdk"
        "-DPICO_TOOLCHAIN_PATH=${cc}/bin"
      ];
    };

  pico-sdk = pkgs.pico-sdk.overrideAttrs (old: rec {
    version = "1.5.1";
    src = pkgs.fetchFromGitHub {
      fetchSubmodules = true;
      owner = "raspberrypi";
      repo = "pico-sdk";
      rev = version;
      hash = "sha256-GY5jjJzaENL3ftuU5KpEZAmEZgyFRtLwGVg3W1e/4Ho=";
    };
  });

in pkgs.callPackage tattlekey { inherit pico-sdk; }