Index: trunk/psconfig/pschecklibs
===================================================================
--- trunk/psconfig/pschecklibs	(revision 34087)
+++ trunk/psconfig/pschecklibs	(revision 42377)
@@ -2,4 +2,6 @@
 
 $tagsets = "tagsets";
+if (!-d $tagsets || !-r $tagsets || !-x $tagsets) { die "missing the directory of distribution tables: $tagsets\n"; }
+
 $needdev = 0;
 
@@ -55,6 +57,5 @@
 
 if ( @ARGV == 0) {
-    @list = <$tagsets/*.libs>;
-    $file = $list[-1];
+    die "a distribution name is now required by pschecklibs (e.g., ipp-ubuntu)\n";
 } else {
     $file = "$tagsets/$ARGV[0].libs";