anchor.diff: -{ config, lib, pkgs, ... }:
  +{ config, pkgs, ... }:
  +
   {
  -
     # List packages installed in system profile. To search by name, run:
     # $ nix-env -qaP | grep wget
     environment.systemPackages =
  
positive.code:   # Create /etc/bashrc that loads the nix-darwin environment.
    programs.bash.enable = true;
  
    # Recreate /run/current-system symlink after boot.
    services.activate-system.enable = true;
  
    # Used for backwards compatibility, please read the changelog before changing.
    # $ darwin-rebuild changelog
    system.stateVersion = 2;
  
negative.code:   # You should generally set this to the total number of logical cores in your system.
    # $ sysctl -n hw.ncpu
    nix.maxJobs = 1;
    nix.buildCores = 1;
  }
  