{
  config,
  pkgs,
  lib,
  ...
}:

{
  nix = {
    distributedBuilds = true;
    # 
    buildMachines = builtins.filter (machine: !builtins.any (ip: ip == machine.hostName) (builtins.map (iface: iface.ipv4.addresses) (builtins.attrValues config.networking.interfaces))) [
      {
        systems = [
          "x86_64-linux"
          "i686-linux"
        ];
        hostName = "192.168.0.3";
        sshUser = "Rory";
        sshKey = "/home/Rory/.ssh/id_ed25519";
        maxJobs = 6;
        speedFactor = 43200;
      }
      {
        systems = [
          "x86_64-linux"
          "i686-linux"
        ];
        hostName = "192.168.0.59";
        sshUser = "Rory";
        sshKey = "/home/Rory/.ssh/id_ed25519";
        maxJobs = 2;
        speedFactor = 16000;
      }
    ];

    #ssh://Rory@192.168.0.3 x86_64-linux,i686-linux /home/Rory/.ssh/id_ed25519 12 1 - - -
    registry.nixpkgs.flake = pkgs;
    nixPath = [ "nixpkgs=flake:nixpkgs" ];
    settings = {
      builders-use-substitutes = true;
      #builders 
      trusted-substituters = [
        "https://nix-community.cachix.org"
        "https://cache.garnix.io"
        "https://numtide.cachix.org"
      ];
      trusted-public-keys = [
        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
        "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="
        "numtide.cachix.org-1:2ps1kLBUWjxIneOy1Ik6cQjb41X0iXVXeHigGmycPPE="
      ];
      trusted-users = [
        "root"
        "@wheel"
        "Rory"
      ];
    };
  };

}