{
  # Snowfall Lib provides a customized `lib` instance with access to your flake's library
  # as well as the libraries available from your flake's inputs.
  lib,
  # An instance of `pkgs` with your overlays and packages applied is also available.
  pkgs,
  # You also have access to your flake's inputs.
  inputs,

  # Additional metadata is provided by Snowfall Lib.
  namespace, # The namespace used for your flake, defaulting to "internal" if not set.
  system, # The system architecture for this host (eg. `x86_64-linux`).
  target, # The Snowfall Lib target for this system (eg. `x86_64-iso`).
  format, # A normalized name for the system target (eg. `iso`).
  virtual, # A boolean to determine whether this system is a virtual target using nixos-generators.
  systems, # An attribute map of your defined hosts.

  # All other arguments come from the module system.
  config,
  ...
}:

let
  cfg = config.modules.builder;
in
{
  options.modules.builder = {
    enable = lib.mkOption { default = false; };
  };

  config = lib.mkIf cfg.enable {
    nix.distributedBuilds = true;
    nix.settings.builders-use-substitutes = true;

    nix.buildMachines = [
      {
        hostName = "builder.julian-mutter.de";
        protocol = "ssh";
        sshUser = "nix";
        systems = [
          "x86_64-linux"
          "aarch64-linux"
        ];
        maxJobs = 4;
        speedFactor = 3;
        supportedFeatures = [
          "nixos-test"
          "benchmark"
          "big-parallel"
          "kvm"
        ];
        mandatoryFeatures = [ ];
      }
      # {
      #   hostName = "localhost";
      #   protocol = null;
      #   systems = [
      #     "x86_64-linux"
      #   ];
      #   maxJobs = 4;
      #   speedFactor = 1;
      # }
    ];
  };
}