The ``dfs'' package is not one of those automatically included in the UnixWare installation process: you can change this setting using the installation menus, which allow packages to be selected or deselected as required.
If UnixWare has already been installed, you can add the DFS system using either the pkgadd(1M) utility, or the Application Installer utility. Refer to ``Installing, managing, and removing software'' for more information on adding packages to a ready-installed UnixWare system.