expat for IronPython 2.7.1 beta 2

I'm trying t开发者_开发知识库o get NLTK working with IronPython 2.7.1. The installation works so far, but I tried some sample code and the expat module is missing. Any hint how to get that up and running for IronPython? I found some hints on the web, but they are quite outdated (IronPython 2.0) and are using python projects which seem to be dead.

The version from the old FePy project (here) should still work, but it's incomplete and might not have all of the capabilities NLTK needs.