anchor.diff:    # List packages installed in system profile. To search, run:
     # $ nix search wget
     # environment.systemPackages = with pkgs; [
  -  #   wget vim
  +  #   vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
  +  #   wget
  +  #   firefox
     # ];
   
     # Some programs need SUID wrappers, can be configured further or are
  
positive.code:   # Per-interface useDHCP will be mandatory in the future, so this generated config
    # replicates the default behaviour.
    networking.useDHCP = false;
    networking.interfaces.vboxnet0.useDHCP = true;
    networking.interfaces.wlp2s0.useDHCP = true;
  
    # Configure network proxy if necessary
  
negative.code: 
    # Enable the X11 windowing system.
    # services.xserver.enable = true;
  
    # Configure keymap in X11
    # services.xserver.layout = "us";
    # services.xserver.xkbOptions = "eurosign:e";
  
    # Enable touchpad support (enabled default in most desktopManager).
    # services.xserver.libinput.enable = true;
  
    # Enable the Plasma 5 Desktop Environment.
    # services.xserver.displayManager.sddm.enable = true;
    # services.xserver.desktopManager.plasma5.enable = true;
  
  