Sorry that it took so long, but I ran into trouble when trying out trunk instead of 3.2.1. It has nothing to do with the zookeeper code, I think, but more with my environment. After switching to trunk, I got back the original error and have been struggling with it since. I'm running on Fedora9. So, to make sure that it works the line "/usr/local/lib/" needs to be in the /etc/ld.so.conf. If it is but it is still not working you have to run /sbin/ldconfig.
What I previous wrote about the different versions of Python, doesn't seem to apply any more, works fine for python2,5. On my laptop where I run Ubuntu9.4 I don't have this problem. Regards Erik