-libosl. gengetopt is needed to build the oslfsck executable, and
-help2man to generate its man page.
+libosl. lopsub is needed to build the oslfsck executable and to
+generate its man page. Download and install lopsub with
+
+ git clone git://git.tuebingen.mpg.de/lopsub
+ cd lopsub && make && sudo make install