--- wp-includes/class-simplepie.php	2012-10-16 14:26:41.000000000 -0500
+++ wp-includes/class-simplepie.php.new	2012-10-16 14:26:34.000000000 -0500
@@ -7697,6 +7697,10 @@
 				curl_setopt($fp, CURLOPT_REFERER, $url);
 				curl_setopt($fp, CURLOPT_USERAGENT, $useragent);
 				curl_setopt($fp, CURLOPT_HTTPHEADER, $headers2);
+				if (defined('WP_PROXY_HOST')) {
+					curl_setopt($fp, CURLOPT_PROXY, WP_PROXY_HOST);
+					curl_setopt($fp, CURLOPT_PROXYPORT, WP_PROXY_PORT);
+				}
 				if (!ini_get('open_basedir') && !ini_get('safe_mode') && version_compare(SimplePie_Misc::get_curl_version(), '7.15.2', '>='))
 				{
 					curl_setopt($fp, CURLOPT_FOLLOWLOCATION, 1);