Docutils has an undocumented dependency on roman.py (it's not mentioned on the website anyway) and I'm currently having trouble finding it to install it. Google searches bring up various Linux packages which aren't helpful.
roman.py is included with Docutils. It seems that setuptools/easy_install removes it when upgrading but doesn't replace it. I first heard about this about a week ago; could be a recent setuptools bug.
You can get roman.py here: http://docutils.sourceforge.net/extras/roman.py
If you're working from an SVN checkout, see http://docutils.sourceforge.net/docs/dev/policies.html#setting-up-for-docutils-development
The dependency is mentioned in at least two places: README.txt and the Distributor's Guide (http://docutils.sourceforge.net/docs/dev/distributing.html).
I'm closing this issue, but a permanent solution would be welcome.