Libopt has been registered at APP under the number ...
The current version of the package is version 2.1 (January, 2009).
Libopt can actually be retrieved by one of the following two manners.
svn co svn://scm.gforge.inria.fr/svn/libopt-public libopt
Note that the repository directory is libopt-public, while the above command installs Libopt locally in the directory libopt.
This procedure requires to have svn installed on one's system. It makes the future updates of the software easy, since to get the latest version, it will suffice to enter
svn update
in the local libopt directory.
Once the software has been retrieved by one of these two methods, read the README file in the head directory of the Libopt hierarchy to have more information on the software, in particular on the installation procedure.