http://bugs.gentoo.org/show_bug.cgi?id=86467
http://lists.gnu.org/archive/html/bug-tar/2005-03/msg00001.html

Index: src/create.c
===================================================================
RCS file: /cvsroot/tar/tar/src/create.c,v
retrieving revision 1.92
retrieving revision 1.93
diff -u -p -r1.92 -r1.93
--- src/create.c	15 Feb 2005 15:24:35 -0000	1.92
+++ src/create.c	3 Mar 2005 23:13:14 -0000	1.93
@@ -1397,7 +1397,7 @@ dump_file0 (struct tar_stat_info *st, ch
       && OLDER_STAT_TIME (st->stat, m)
       && (!after_date_option || OLDER_STAT_TIME (st->stat, c)))
     {
-      if (!incremental_option)
+      if (!incremental_option && verbose_option)
 	WARN ((0, 0, _("%s: file is unchanged; not dumped"),
 	       quotearg_colon (p)));
       return;