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diff --git a/configure b/configure
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index 057d5a9..2f34d4a 100755
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--- a/configure
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+++ b/configure
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@@ -2758,8 +2758,8 @@ main ()
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   for (i = 0; i < 256; i++)
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     if (XOR (islower (i), ISLOWER (i))
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         || toupper (i) != TOUPPER (i))
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-      exit(2);
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-  exit (0);
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+      return 2;
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+  return 0;
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 }
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 _ACEOF
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 rm -f conftest$ac_exeext