--- a/ext/standard/datetime.c
+++ b/ext/standard/datetime.c
@@ -20,6 +20,9 @@
 
 /* $Id: datetime.c 293036 2010-01-03 09:23:27Z sebastian $ */
 
+#define _XOPEN_SOURCE	/* needed to get strptime() declared */
+#define _BSD_SOURCE		/* needed to get ulong declared */
+
 #include "php.h"
 #include "zend_operators.h"
 #include "datetime.h"