--- a/build/main.rs.orig
+++ b/build/main.rs
@@ -451,6 +451,7 @@
             (4, 0, _) => ('4', '0', 'x'),
             (4, 1, 0) => ('4', '1', '0'),
             (4, 1, _) => ('4', '1', 'x'),
+            (_, _, _) => ('x', 'x', 'x'),
             _ => version_error(),
         };