diff -up Python-3.3.0/configure.ac.fix-configure-Wformat Python-3.3.0/configure.ac
--- Python-3.3.0/configure.ac.fix-configure-Wformat	2013-03-25 16:09:09.127667472 -0400
+++ Python-3.3.0/configure.ac	2013-03-25 16:09:16.442666967 -0400
@@ -1308,7 +1308,7 @@ 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)));]], [[]])
   ],[