{
  pkgs,
  ...
}:
{
  nixpkgs.overlays = [
    (final: prev: {
      inherit (final.lixPackageSets.latest)
        nixpkgs-review
        nix-eval-jobs
        nix-fast-build
        colmena
        ;
    })
  ];

  programs.direnv = {
    enable = true;
    nix-direnv.enable = true;
    nix-direnv.package = pkgs.lixPackageSets.latest.nix-direnv;

  };

  nix = {
    package = pkgs.lixPackageSets.latest.lix;

    extraOptions = ''
      experimental-features = nix-command flakes
      narinfo-cache-negative-ttl = 0
    '';
  };

  # nix output-monitor
  environment.systemPackages = [ pkgs.nix-output-monitor ];

  nixpkgs.flake = {
    setFlakeRegistry = true;
    setNixPath = true;
  };

  nixpkgs.config.allowUnfree = true;
}