{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    arduino-sketch-builder-nix.url = "git+https://git.clerie.de/clerie/arduino-sketch-builder-nix.git";
    arduino-esp32 = {
      url = "github:espressif/arduino-esp32/gh-pages";
      flake = false;
    };
  };
  outputs = { self, nixpkgs, arduino-sketch-builder-nix, arduino-esp32, ... }: {
    packages.x86_64-linux = let
      pkgs = import nixpkgs {
        system = "x86_64-linux";

        overlays = [
          (arduino-sketch-builder-nix.overlay)
          (arduino-sketch-builder-nix.mkArduinoPackageOverlay ./package_index.json)
          (arduino-sketch-builder-nix.mkArduinoPackageOverlay (arduino-esp32 + "/package_esp32_index.json"))
        ];
      };

      arduinoEnv = pkgs.mkArduinoEnv {
        packages = with pkgs.arduinoPackages; [
          platforms.esp32.esp32."2.0.14"
        ];
        runtimeInputs = with pkgs; [
          (python3.withPackages(ps: with ps; [ pyserial ]))
        ];
      };
    in {

      inherit arduinoEnv;

      olimex-esp32-poe = arduinoEnv.buildArduinoSketch {
        name = "olimex-esp32-poe";
        src = ./. + "/olimex-esp32-poe";
        fqbn = "esp32:esp32:esp32-poe-iso";
      };
      
      default = self.packages.x86_64-linux.arduinoEnv;
    };

    hydraJobs = {
      olimex-esp32-poe = self.packages.x86_64-linux.olimex-esp32-poe.binaryTarball;
    };
  };
}