diff -up Python-2.7.3/configure.ac.fix-configure-Wformat Python-2.7.3/configure.ac
--- Python-2.7.3/configure.ac.fix-configure-Wformat	2013-03-25 15:15:18.473888383 -0400
+++ Python-2.7.3/configure.ac	2013-03-25 15:15:32.513887426 -0400
@@ -1200,7 +1200,7 @@ if test "$GCC" = "yes"
 then
   AC_MSG_CHECKING(whether gcc supports ParseTuple __format__)
   save_CFLAGS=$CFLAGS
-  CFLAGS="$CFLAGS -Werror"
+  CFLAGS="$CFLAGS -Werror -Wformat"
   AC_COMPILE_IFELSE([
     AC_LANG_PROGRAM([[void f(char*,...)__attribute((format(PyArg_ParseTuple, 1, 2)));]], [[]])
   ],[