-As the bare minimum, you'll need gcc-4 and gnu make to install
-libosl. lopsub is needed to build the oslfsck executable and to
-generate its man page. Download and install lopsub with
+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