anchor.diff:  	    ${optionalString cfg.withHadoop "--hadoop-home=${pkgs.hadoop}"} \
   	    --work_dir=${cfg.workDir} \
   	    --logging_level=${cfg.logLevel} \
  +	    --docker=${pkgs.docker}/libexec/docker/docker \
   	    ${toString cfg.extraCmdLineOptions}
   	'';
   	PermissionsStartOnly = true;
  
positive.code: 
  let
    cfg = config.services.mesos.slave;
    
  in {
  
    options.services.mesos = {
  
negative.code:       '';
      };
    };
  
  }
  