{
  perSystem = { libMy, pkgs, ... }: {
    devenv.shells.mcu = libMy.withRootdir {
      packages = with pkgs; [
        gnumake
        cmake
        pkgsCross.arm-embedded.buildPackages.gdb # ARM one is broken
        gcc-arm-embedded
        python3
        picotool
        openocd-rp2040
      ];

      env = {
        PICO_SDK_PATH = "${pkgs.pico-sdk}/lib/pico-sdk";
      };

      scripts = {
        build.exec = ''
          cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -D PICO_STDIO_SEMIHOSTING=1
          cmake --build build --parallel
        '';
        build-rel.exec = ''
          cmake -S . -B build-release -D CMAKE_BUILD_TYPE=Release
          cmake --build build-release --parallel
        '';
        clean.exec = ''
          rm -rf build/ build-release/
        '';

        ocd.exec = ''
          openocd -f ${./tigard-swd.cfg} -f target/rp2040.cfg
        '';
        gdb.exec = ''
          arm-none-eabi-gdb -x .gdbinit build/qclk.elf
        '';
      };
    };
  };
}