anchor.diff:  
     ###### implementation
   
  -  config = mkIf cfg.enable
  -    (mkAssert (!(cfg.startOpenSSHAgent && cfg.startGnuPGAgent))
  -      ''
  -        The OpenSSH agent and GnuPG agent cannot be started both.
  -        Choose between `startOpenSSHAgent' and `startGnuPGAgent'.
  -      ''
  -  {
  +  config = mkIf cfg.enable (checkAgent (checkPolkit {
   
       boot.extraModulePackages =
         optional (elem "nvidia" driverNames) kernelPackages.nvidia_x11 ++
  
positive.code:         echo "$config" >> $out
        ''; # */
    };
  
  in
  
  
negative.code:     [ pkgs.xorg.fontadobe100dpi
        pkgs.xorg.fontadobe75dpi
      ];
  
  
    # Just enumerate all heads without discarding XRandR output information.
    xrandrHeads = let
  