anchor.diff:          ";
         };
   
  -
         daemonNiceLevel = mkOption {
           default = 2;
           description = "
  -          nix dameon process priority. This priority propagates to build processes.
  -          0 is default unix process priority. 20 is lowest.
  +          Nix daemon process priority. This priority propagates to build processes.
  +          0 is the default Unix process priority, 20 is the lowest.
           ";
         };
   
  
positive.code: 
        script =
          ''
            export PATH=${if config.nix.distributedBuilds then "${pkgs.openssh}/bin:" else ""}${pkgs.openssl}/bin:${nix}/bin:$PATH
            ${config.nix.envVars}
            exec nice -n ${builtins.toString config.nix.daemonNiceLevel} ${nix}/bin/nix-worker --daemon > /dev/null 2>&1
          '';
  
negative.code:           ''
          else "")
          + conf;
        };
      };
    };
  