anchor.diff:  
         config = mkOption {
           default = "";
  -        description = "Extra options to put into virtuoso configuration file.";
  +        description = "Extra options to put into Virtuoso configuration file.";
         };
   
         listenAddress = mkOption {
  
positive.code:       httpListenAddress = mkOption {
  	default = null;
  	example = "myserver:8080";
          description = "ip:port or port for virtuoso HTTP server to listen on.";
        };
  
      };
  
    };
  
negative.code:       [Parameters]
        ServerPort=${cfg.listenAddress}
        RunAs=${virtuosoUser}
        ${optionalString (cfg.dirsAllowed != null) "DirsAllowed=${cfg.dirsAllowed}"}
  
        [HTTPServer]
        ${optionalString (cfg.httpListenAddress != null) "ServerPort=${cfg.httpListenAddress}"}
  