anchor.diff:    #networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
       
     # Enable NVidia driver support
  -  nixpkgs.config.allowUnfree = true;
  +  #nixpkgs.config.allowUnfree = true;
     #iservices.xserver.videoDrivers = [ "nvidia" ];
     
     # Configure network proxy if necessary
  
positive.code:       gnome3.eog
        gnome3.dconf
        i3lock-color
        feh
        rofi
        arc-theme
        papirus-icon-theme
  
negative.code:     };
      windowManager = {
        i3.enable = true;
        i3.package = pkgs.i3-gaps;
      };
    };
    # services.xserver.xkbOptions = "eurosign:e";
  