diff --git a/configure.in b/configure.in
--- a/configure.in
+++ b/configure.in
@@ -4246,6 +4246,36 @@
   AC_DEFINE(HAVE_BROKEN_PIPE_BUF, 1, [Define if the system reports an invalid PIPE_BUF value.]) ;;
 esac
 
+# Check whether signed arithmetic overflow is well defined:
+SIGNED_OVERFLOW_WARN="
+***************************** WARNING *********************************
+
+Signed arithmetic overflow is undefined. It is not safe to run Python.
+Check if your compiler supports a flag similar to gcc's -fwrapv and
+recompile.
+
+***************************** WARNING *********************************
+"
+
+AC_MSG_CHECKING(whether signed arithmetic overflow is well defined)
+saved_cflags="$CFLAGS"
+CFLAGS="$BASECFLAGS $OPT $CFLAGS $EXTRA_CFLAGS"
+AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <limits.h>
+int overflow_is_defined(int x) {
+    if (x + 1000 < x)
+        return 0;
+    return 1;
+}
+int main() {
+    return overflow_is_defined(INT_MAX);
+}
+]])],
+[have_well_defined_overflow=yes],
+[have_well_defined_overflow=no],
+[have_well_defined_overflow=cross_compiling])
+CFLAGS="$saved_cflags"
+AC_MSG_RESULT($have_well_defined_overflow)
 
 AC_SUBST(THREADHEADERS)
 
@@ -4286,3 +4316,7 @@
 			-s Modules Modules/Setup.config \
 			Modules/Setup.local Modules/Setup
 mv config.c Modules
+
+if test "$have_well_defined_overflow" = no; then
+    echo "$SIGNED_OVERFLOW_WARN"
+fi