anchor.diff:            Allow from all
             DirectoryIndex index.php
         </Directory>
  +
  +      ${optionalString (config.articleUrlPrefix != "") ''
  +        Alias ${config.articleUrlPrefix} ${mediawikiRoot}/index.php
  +      ''}
       '';
   
     options = {
  
positive.code:       description = "Name of the wiki";
      };
  
      urlPrefix = mkOption {
        example = "/wiki";
        default = "/wiki";
        description = ''
          The URL prefix under which the Mediawiki service appears.
        '';
      };
  
  
negative.code: 
          $wgSitename = "${config.siteName}";
  
          ${optionalString (config.logo != "") ''
            $wgLogo = "${config.logo}";
          ''}
  
          ${optionalString (config.articleUrlPrefix != "") ''
            $wgArticlePath = "${config.articleUrlPrefix}/$1";
          ''}
  
          ${config.extraConfig}
        ?>
      '';
  