First you have to get a local copy of the epsos-common-components openncp-portal repository with this command:

git clone https://code.google.com/p/epsos-common-components.openncp-portal/

and then inside this directory you have to run the following commands:

mvn clean
mvn package
mvn liferay:deploy

Double check that before running mvn liferay:deploy you have configured pom.xml to point to your LIFERAY_HOME in order to correct deploy the epsos portlet to your liferay binary installation directory

<liferay.auto.deploy.dir>/home/karkaletsis/Documents/j2ee/liferay-portal-6.1.0-ce-ga1/deploy</liferay.auto.deploy.dir>

After this login to the portal using administrator credentials and from the top left menu, select add --> more --> Category.epsos --> portalb and the portlet will be displayed in your page

You can also add the "Config Manager" portlet which gives CRUD methods for the epsos.properties database