Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 78265)
+++ Modules/posixmodule.c	(working copy)
@@ -23,6 +23,10 @@
 #  pragma weak statvfs
 #  pragma weak fstatvfs
 
+/* Monkey patch pyconfig.h */
+#include "pyconfig.h"
+#undef _DARWIN_C_SOURCE 
+
 #endif /* __APPLE__ */
 
 #define PY_SSIZE_T_CLEAN