I was able to workaround this issue:
- stop any service using Python from the
virtualenv
- remove all eggs from the
eggs
directory - remove the
virtualenv
- create a new
virtualenv
using:
virtualenv --no-setuptools env27 - bootstrap your buildout again, in my case:
python bootstrap.py --version=2.4.0 --setuptools-version=18.0.1 - run buildout again
now everything is working as expected.