anchor.diff:  
   
     # The configuration file for Grub.
  -  grubCfg = pkgs.writeText "menu.lst" ''
  +  grubCfg = pkgs.writeText "menu.lst" (''
       default 0
       timeout 10
       splashimage /boot/background.xpm.gz
  
positive.code:     else "nixos-${builtins.readFile ../../VERSION}"
  , compressImage ? false
  , nixpkgs ? ../../../nixpkgs
  }:
  
  rec {
  
negative.code: 
      title Memtest86+
        kernel /boot/memtest.bin
    '' 
      + (pkgs.lib.concatStringsSep "\n\n" 
          (map (x: ''
  	  title NixOS: ${x.configurationName}
  	    kernel ${x.kernel} systemConfig=${x} init=${x.bootStage2} ${toString system.config.boot.kernelParams}
  	    initrd ${x.initrd}
  	'') system.children)))
      ;
  
  
    # Create an ISO image containing the Grub boot loader, the kernel,
  