+#if HTTP_CURL_VERSION(7,18,0)
+ zend_declare_class_constant_long(THIS_CE, ZEND_STRS("PROXY_SOCKS4A")-1, CURLPROXY_SOCKS5 TSRMLS_CC);
+ zend_declare_class_constant_long(THIS_CE, ZEND_STRS("PROXY_SOCKS5_HOSTNAME")-1, CURLPROXY_SOCKS5 TSRMLS_CC);
+#endif