--- twisted/python/sendmsg.c.old	Mon Mar  3 14:32:08 2014
+++ twisted/python/sendmsg.c	Mon Mar  3 14:30:22 2014
@@ -6,6 +6,8 @@
 #define PY_SSIZE_T_CLEAN 1
 #include <Python.h>
 
+#define _XPG4_2 1
+
 #if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
 /* This may cause some warnings, but if you want to get rid of them, upgrade
  * your Python version.  */
