let
  supportedFeatures = [
    "nixos-test"
    "benchmark"
    "big-parallel"
    "kvm"
  ];
in
{ pkgs, ... }:
{
  nix.buildMachines = [
    # NOTE: these hosts need to be put in the .ssh/config of root.
    # https://wiki.nixos.org/wiki/Distributed_build#Recommended_setup:_multi-user_Nix_local_%E2%80%93%3E_multi-user_Nix_remote
    {
      hostName = "pancake";
      sshUser = "remotebuild";
      speedFactor = 2;
      system = pkgs.stdenv.hostPlatform.system;
      maxJobs = 1;
      inherit supportedFeatures;
    }
    {
      hostName = "hetzner_benchmark";
      sshUser = "remotebuild";
      speedFactor = 12;
      system = pkgs.stdenv.hostPlatform.system;
      maxJobs = 3;
      inherit supportedFeatures;
    }
  ];
}