There are multiple ways to install Liferay on your Funtoo System. Note: I will use tomcat as server, there might be slight differences if you want to use another server like glassfish.
1) Tomcat + Liferay - Manual setup.
2) Tomcat + Liferay - Bundle.
3) Tomcat + Liferay - Ebuild.
I have chosen to use the third method.
Tomcat + Liferay - Ebuild:
First we need to add an overlay (https://github.com/cvut/gentoo-overlay) to our current system, since the ebuild is not part of the gentoo,funtoo tree. You need to have layman correctly installed. Then add the following git overlay using layman:
layman -o https://raw.github.com/cvut/gentoo-overlay/master/overlay.xml -f -a cvut
You need to have Java (JDK)
Now install: 'emerge liferay-portal'
For liferay to work you need a SQL Database.
b) DB2 -IBM
If you use b) or c) you need to take care of a JDBC driver for your DB yourself
Liferay supports many different DBs but I would chose a) or b): Install your DB and create a new user (=liferay-user) and a new Database (=lportal). Start your DBs Deamon and make sure your firewall (iptables) allows loopback access for localhost.
Then configure /etc/liferay-6.2/portal-context.xml to use the DB correctly. (Username,Password,..)
Now you can start liferay and login (x.x.x.x:8080) with email@example.com, password=test, you should change the username + password as soon as possible.
This section is in need of updates.