import IGES in NETGEN

Hi to all.
I installed NETGEN and use Ubuntu Lucid Lynx. I need OpenCascade libraries in order to import IGES geometries, but I'm not so expert of linux to understand how to get it. I have two NETGEN becouse I installed it via PPA CAE Team repository (so it's into /usr/share/netgen folder) and also compiled it (in /opt/netgen). If I'm correct, I must install OpenCascade somewhere and 'tell' to NETGEN where it can find OpenCascade libraries, but I don't know how to do that. I'm a linux beginner, I've been using Ubuntu since March. Please, can anoyone help me? Thanks.