Most people prefer to install the distro package rather than
downloading the tarball from the FTP server. This also removes the
sentence about a recent version of gengetopt, since there has been
no gengetopt release for a while and all moderately recent distros
ship the newest version.
As adu is based on libosl, the object storage layer, you first have
to install http://people.tuebingen.mpg.de/maan/osl/ (libosl).
-Adu's command line parser and the interactive help
-are generated using gnu gengetopt. You'll likely need a
-ftp://ftp.gnu.org/pub/gnu/gengetopt/ (recent version) to compile adu
-from source.
+Adu's command line parser and the interactive help are generated by
+http://www.gnu.org/software/gengetopt/gengetopt.html (gnu gengetopt).
+Hence the gengetopt package must be installed to compile adu from
+source.
In order to generate the man page,
ftp://ftp.gnu.org/pub/gnu/help2man (help2man)