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

  imports = [

    ../../backup-module
    ../../krops-lib
    ../../cluster-module
    ../../modules

    # needed
    #<home-manager/nixos>

    # cross-compiling
    #<cleverca22/qemu.nix>

    ./grub.nix
    ./networking-qos.nix
    ./nginx-landingpage.nix
    ./nginx.nix
    ./packages.nix
    ./borg-jobs.nix
    ./borg-scripts.nix
    ./sshd-known-hosts-bootup.nix
    ./sshd-known-hosts-private.nix
    ./sshd-known-hosts-public.nix
    ./sshd.nix
    ./syncthing.nix
    ./tinc.nix
    ./on-failure.nix
    ./hosts.nix

  ];

  # default backup excludes
  backup.exclude = [ ".git" ".stfolder" ".stversions" ];

  # provide overlays
  # -----------------
  nixpkgs.overlays = [ (import ../../pkgs) ];

  # allow un-free
  # -------------
  nixpkgs.config.allowUnfree = true;
  environment.variables.NIXPKGS_ALLOW_UNFREE = "1";

  # some system stuff
  # -----------------
  time.timeZone = lib.mkDefault "Europe/Berlin";
  #time.timeZone = lib.mkDefault "Pacific/Auckland";
  #time.timeZone = lib.mkDefault "Asia/Singapore";
  #time.timeZone = lib.mkDefault "Asia/Makassar";

  # keyboard fiddling
  i18n.defaultLocale = lib.mkDefault "en_US.UTF-8";
  console.font = "Lat2-Terminus16";
  console.keyMap = lib.mkDefault "us";
  services.xserver.layout = lib.mkDefault "us";

  # swappiness
  # ----------
  # 0 = only when running out of RAM
  # 100 = always swapp
  boot.kernel.sysctl."vm.swappiness" = 0;

  # rewire NIX_PATH
  # ---------------
  environment.variables.NIX_PATH = lib.mkForce "/var/src";

  # Shell configuration
  # -------------------
  programs.custom = {
    bash.enable = true;
    zsh.enable = true;
  };

  # Machines should be fast by default
  # ----------------------------------
  powerManagement.cpuFreqGovernor = lib.mkDefault "ondemand";

  # set vim to the default editor
  # -----------------------------
  programs.vim.defaultEditor = true;

  # This value determines the NixOS release with which your system is to be
  # compatible, in order to avoid breaking some software such as database
  # servers. You should change this only after NixOS release notes say you
  # should.
  system.stateVersion = "19.03"; # Did you read the comment?

}