distutils.command.config which is used really rarely uses a constant temporary file name named '_configtest'. Trying to use any of its command in parallel results in unexpected results. I believe the command should be using tempfile instead.
Michal, reading at the report you filed at bugs.python.org, upstream doesn't want to improve the situation wrt this special problem. What's the next step now? Can we close this bug report?
Yeah. We don't do parallel stuff anymore, so no need to bother.