{config, lib, pkgs, ... }: {
  nix.buildMachines = [
    {
      hostName = "seras.kyouma.net";
      sshUser = "build";
      maxJobs = 40;
      speedFactor = 40;
      systems = [ "x86_64-linux" ];
      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
    }
    {
      hostName = "integra.kyouma.net";
      sshUser = "build";
      maxJobs = 4;
      speedFactor = 8;
      systems = [ "aarch64-linux" ];
      supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
    }
  ];
  nix.distributedBuilds = true;
  programs.ssh = {
    knownHosts = {
      "seras.kyouma.net".publicKey = "sh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPNVavo3YHVsrYwXRVISu7kDoknn+5inFGySn4azlB8P";
      "integra.kyouma.net".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIBwEQiSfaDrUAwgul4mktusBPcIVxI4pLNDh9DPopVU";
    };
  };
}