anchor.diff:  
     modprobe = config.system.sbin.modprobe;
   
  +  cfg = config.services.printing;
   
     # Here we can enable additional backends, filters, etc. that are not
     # part of CUPS itself, e.g. the SMB backend is part of Samba.  Since
  
positive.code:           default = false;
            description = "
              Whether to enable printing support through the CUPS daemon.
            ";
          };
  
  
negative.code:     ensureDir $out/lib/cups/filter
      ln -s ${cups}/lib/cups/filter/* $out/lib/cups/filter/
      ln -s ${pkgs.ghostscript}/lib/cups/filter/* $out/lib/cups/filter/
      ${cfg.bindirCmds}
    ''; # */
    
  
  