{ pkgs, unstable, ... }: {
  nixpkgs.config.allowUnfree = true;
  nixpkgs.config.segger-jlink.acceptLicense = true;

  # TODO: whygodwhy.jpg
  nixpkgs.config.permittedInsecurePackages = [ "segger-jlink-qt4-796s" ];

  environment.systemPackages = with pkgs; [
    unstable.platformio # https://github.com/NixOS/nixpkgs/commit/0ba947ba44fc17c7cc94be2374dbfb939900cecd
    segger-jlink

    arduino-ide
    stm32cubemx

    avrdude
    esptool
    stlink
    stlink-gui
    (kicad-small.override { addons=[kicadAddons.kikit kicadAddons.kikit-library]; })
    kikit
    screen
    prusa-slicer
    esphome
    librecad
    pulseview
    sigrok-cli
  ];

  services.udev.packages = with pkgs; [
    platformio
    platformio-core

    openocd
    stlink
    esptool
    avrdude
  ];

  services.udev.extraRules = ''
    SUBSYSTEM=="usb", ATTR{idVendor}="1a86", ATTR{idProduct}=="8010", MODE="0666"
    SUBSYSTEM=="usb", ATTR{idVendor}="4348", ATTR{idProduct}=="55e0", MODE="0666"
    SUBSYSTEM=="usb", ATTR{idVendor}="1a86", ATTR{idProduct}=="8012", MODE="0666"
  '';
}