--- configure.orig	2006-06-22 06:32:38
+++ configure	2023-03-06 02:25:36
@@ -3004,8 +3004,8 @@
   for (i = 0; i < 256; i++)
     if (XOR (islower (i), ISLOWER (i))
 	|| toupper (i) != TOUPPER (i))
-      exit(2);
-  exit (0);
+      return (2);
+  return (0);
 }
 _ACEOF
 rm -f conftest$ac_exeext