anchor.diff:          description = ''
             Whether to install documentation of packages from
             <option>environment.systemPackages</option> into the generated system path.
  +
  +          See "Multiple-output packages" chapter in the nixpkgs manual for more info.
           '';
  +        # which is at ../../../doc/multiple-output.xml
         };
   
         man.enable = mkOption {
  
positive.code:         description = ''
            Whether to install manual pages and the <command>man</command> command.
            This also includes "man" outputs.
          '';
        };
  
  
negative.code:         '';
        };
  
  
      };
  
  