--- coreutils-5.2.1/src/tail.c	2004-01-21 22:27:02.000000000 +0000
+++ ./tail.c	2004-07-18 13:44:23.797293952 +0000
@@ -1033,7 +1033,7 @@
 	  /* reset counter */
 	  f[i].n_unchanged_stats = 0;
 
-	  if (stats.st_size < f[i].size)
+	  if (!S_ISFIFO(stats.st_mode) && (stats.st_size < f[i].size))
 	    {
 	      error (0, 0, _("%s: file truncated"), pretty_name (&f[i]));
 	      last = i;