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diff -up Python-3.3.0/configure.ac.fix-configure-Wformat Python-3.3.0/configure.ac
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--- Python-3.3.0/configure.ac.fix-configure-Wformat	2013-03-25 16:09:09.127667472 -0400
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+++ Python-3.3.0/configure.ac	2013-03-25 16:09:16.442666967 -0400
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@@ -1308,7 +1308,7 @@ if test "$GCC" = "yes"
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 then
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   AC_MSG_CHECKING(whether gcc supports ParseTuple __format__)
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   save_CFLAGS=$CFLAGS
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-  CFLAGS="$CFLAGS -Werror"
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+  CFLAGS="$CFLAGS -Werror -Wformat"
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   AC_COMPILE_IFELSE([
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     AC_LANG_PROGRAM([[void f(char*,...)__attribute((format(PyArg_ParseTuple, 1, 2)));]], [[]])
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   ],[