old g++ fail to compile the testcase

examples/cpp/add_vectors_interface.cpp

@@ -22,6 +22,12 @@
  * transfers between objects.
  */
 
+#if defined(__GNUC__) && (__GNUC__ < 4 || __GNU_MINOR < 9)
+int main(int argc, char **argv)
+{
+	return 77;
+}
+#else
 #include <cassert>
 #include <vector>
 
@@ -647,3 +653,4 @@ int main(int argc, char **argv)
 		return EXIT_SUCCESS;
 	}
 }
+#endif