Skip this test if `.' is on an XFS file system.

tests/du/slink

@@ -26,6 +26,14 @@ else
   (exit 77); exit
 fi
 
+df --type=xfs . | tail -n +2 > tmp
+if test -s tmp; then
+  # At least on Irix-6.5.19, when using an xfs file system,
+  # each created symlink (name lengths up to 255) would have a size of `0'.
+  echo "$0: skipping this test, since \`.' is on an XFS file system" 1>&2
+  (exit 77); exit
+fi
+
 if test $framework_failure = 1; then
   echo "$0: failure in testing framework" 1>&2
   (exit 1); exit 1