Display @url{http://cr.yp.to/libtai/tai64.html, TAI64N} timestamped
last @command{stderr} of the target.
+@item redo-targets, redo-sources, redo-ood
+ List known targets, sources and out-of-date targets.
+
@item redo-stamp
Record stamp dependency. Nothing more, dummy. Read about
@ref{Stamping, stamping} in the FAQ.