Use of undefined constant gns_autobuild

PHP 5x throws:

PHP Warning: Use of undefined constant gns_autobuild - assumed 'gns_autobuild' (this will throw an Error in a future version of PHP) in html/wp-content/plugins/gn-xml-sitemap/main.php on line 37
PHP Warning: Use of undefined constant gns_autobuild - assumed 'gns_autobuild' (this will throw an Error in a future version of PHP) in html/wp-content/plugins/gn-xml-sitemap/main.php on line 38

Suggested patch:

 37,38c37,38
 < 	add_action('delete_post', gns_autobuild ,9999,1);
 < 	add_action('publish_post', gns_autobuild ,9999,1);
 ---
 > 	add_action('delete_post', 'gns_autobuild' ,9999,1);
 > 	add_action('publish_post', 'gns_autobuild' ,9999,1);