cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/segusoland checkout segusoland
This will create a directory called segusoland in your current dir, and put the source code in it.
You can also browse the source code online with sourceforge: go to http://sourceforge.net/projects/segusoland/ and click "CVS", then "Browse CVS repository", then choose the module "segusoland".
The instructions for compiling are in the file install-instructions.html, in the sources.
If you want to help me with the code, you can send me a patch (ask me if you don't know what it means), but if you want commit access, it is very easy: see section "helping".