If you want to build ivata groupware from source, you have 2 choices:
Each time we release a binary version of ivata groupware, we create an associated source release. Source code releases are more stable, but they won't have the latest features.
CVS gives you the very latest version of the code, but some of the features might still be under development and may not yet be ready for production systems.
Getting the source code for an official release is a simple as downloading and unpacking an archive file.
For every release, there is a corresponding zip file with all the
sources for that release, called ivatagroupware-src-{version}.zip.
Download that and unpack it somewhere convenient.
cd /usr/src
jar -xvf /tmp/ivatagroupware-src-{version}.zip
ln -s ivatagroupware-src-{version} ivatagroupware
If you need access to the latest source code, you need understanding of CVS and a CVS client.
Follow the instructions explained here to configure your client.
It is even possible to get the CVS from behind a firewall using CVSGrab.