anchor.diff:  
     environment.systemPackages =
       [ config.programs.vim.package
  -      config.services.chunkwm.package
   
         pkgs.awscli
         pkgs.brotli
  
positive.code:   ];
  
    # Dotfiles.
    # nixpkgs.overlays = mkAfter [
    #   (import <dotfiles/nixpkgs/overlays/20-trivial-overrides.nix>)
    #   (import <dotfiles/nixpkgs/overlays/50-trivial-packages.nix>)
    # ];
  
    services.chunkwm.package = pkgs.chunkwm;
    services.chunkwm.hotload = false;
    services.chunkwm.plugins.dir = "${lib.getOutput "out" pkgs.chunkwm}/lib/chunkwm/plugins";
    services.chunkwm.plugins.list = [ "ffm" "tiling" ];
    services.chunkwm.plugins."tiling".config = ''
      chunkc set global_desktop_mode   bsp
    '';
  
    # Dotfiles.
    # services.chunkwm.extraConfig = builtins.readFile <dotfiles/chunkwm/chunkwmrc>;
    # services.skhd.skhdConfig = builtins.readFile <dotfiles/skhd/skhdrc>;
  
    # Dotfiles.
    # $ cat ~/.gitconfig
    # [include]
    #     path = /etc/per-user/lnl/gitconfig
    # environment.etc."per-user/lnl/gitconfig".text = builtins.readFile <dotfiles/git/gitconfig>;
  
    users.nix.configureBuildUsers = true;
    users.nix.nrBuildUsers = 32;
  
negative.code: { config, lib, inputs, pkgs, ... }:
  
  {
    # imports = [ ~/.config/nixpkgs/darwin/local-configuration.nix ];
  