{pkgs, ...}: {
  environment.systemPackages = with pkgs; [
    nix-index
  ];

  programs.command-not-found.enable = false;
  # for home-manager, use programs.bash.initExtra instead
  programs.bash.interactiveShellInit = ''
    source ${pkgs.nix-index}/etc/profile.d/command-not-found.sh
  '';
}