You will need access to postgresql database to use davical.

Read /usr/share/doc/www-apps/davical-0.9.6.2/INSTALL.gz for installation
instructions. Full documentation and wiki on http://davical.org

If you are upgrading from a previous version of davical, don't forget to
upgrade the database structure with
	cd /usr/share/webapps/davical/0.9.6.2/sqlscripts/
	chmod u+x update-davical-database
	./update-davical-database -dbuser xxxxxxx -appuser xxxxxxx