{ pkgs, ... }: {
  environment.systemPackages = with pkgs; [ direnv devenv ];

  nix.extraOptions = ''
    extra-substituters = https://devenv.cachix.org
    extra-trusted-public-keys = devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=
  '';
}