After some tinkering, I have a recipe for compiling OpenCASCADE652 for Linux on a 64 bit architecture.
First, download the ftgl library sources from Sourceforge. Build and install it. But all the .h files
from the source directory must be copied manualy to /usr/include/FTGL.
Make a symbolic link from "/usr/include/FTGL/ftgl.h" to "/usr/include/FTGL/FTGL.h"
Install also a recent java jdk from sun.
In a console change to the "ros" subdirectory from the sources.
Then run "build_configure" and later run "configure" with all this bells and whistles :
