-As the bare minimum, you'll need gcc-4 and gnu make to install
-libosl. gengetopt is needed to build the oslfsck executable, and
-help2man to generate its man page.
+Besides a working C compiler, gnu m4, gnu make and the
+[lopsub](http://people.tuebingen.mpg.de/maan/lopsub/) library must be
+installed to to build and install this package. Download and install
+lopsub with
+
+ git clone git://git.tuebingen.mpg.de/lopsub
+ cd lopsub && make && sudo make install