diff -urN a/ChangeLog b/ChangeLog
--- a/ChangeLog	2004-05-17 00:31:48.000000000 +0400
+++ b/ChangeLog	2011-05-22 02:14:10.396969663 +0400
@@ -0,0 +1,6 @@
+2009-11-28  Jim Meyering  <meyering@redhat.com>
+
+	avoid a warning from perl-5.11
+	* lib/Automake/Wrap.pm (_tab_length): Remove useless use of tr's
+	"/d" modifier.
+
diff -urN a/lib/Automake/Wrap.pm b/lib/Automake/Wrap.pm
--- a/lib/Automake/Wrap.pm	2003-05-22 00:30:07.000000000 +0400
+++ b/Automake/Wrap.pm	2011-05-22 02:12:29.597999284 +0400
@@ -57,7 +57,7 @@ sub tab_length($)
 {
   my ($txt) = @_;
   my $len = length ($txt);
-  $len += 7 * ($txt =~ tr/\t/\t/d);
+  $len += 7 * ($txt =~ tr/\t/\t/);
   return $len;
 }