--- libtool.m4.~1.311.~	2003-03-30 10:06:13.000000000 +1000
+++ libtool.m4	2003-04-02 09:03:17.000000000 +1000
@@ -390,7 +390,8 @@
 	 test "X$echo_testing_string" = "X$echo_test_string"; then
 	# Cool, printf works
 	:
-      elif echo_testing_string=`($ORIGINAL_CONFIG_SHELL "[$]0" --fallback-echo '\t') 2>/dev/null` &&
+      elif test -n "$ORIGINAL_CONFIG_SHELL" &&
+	   echo_testing_string=`($ORIGINAL_CONFIG_SHELL "[$]0" --fallback-echo '\t') 2>/dev/null` &&
 	   test "X$echo_testing_string" = 'X\t' &&
 	   echo_testing_string=`($ORIGINAL_CONFIG_SHELL "[$]0" --fallback-echo "$echo_test_string") 2>/dev/null` &&
 	   test "X$echo_testing_string" = "X$echo_test_string"; then