[Plugin: Google Custom Search Plugin] Activation error

Trying to activate the plugin I receive the following error:

Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or ‘}’ in /xxx/www/wp-content/plugins/google-custom-search-for-wordpress/GoogleCSE.php on line 13

http://wordpress.org/extend/plugins/google-custom-search-for-wordpress/