Problems with virtualenv related to Python 2.7.11

Creating a virtualenv started to fail with Python version 2.7.11 some time between Sep 6 and 26. Corresponding commits from the github repository ouspg/urlhandlers only had changes in documentation, not in code. Relevant builds in are 204 (still working) and 206 (deleted LICENSE, build failing).

The error is related to installing the wheel package with pip when creating the virtualenv:

/opt/circleci/python/2.7.11/bin/python2.7 /opt/circleci/.pyenv/versions/2.7.11/bin/virtualenv /home/ubuntu/virtualenvs/venv-system
/home/ubuntu/virtualenvs/venv-system/bin/python2.7 -c 'import sys, pip; sys.exit(pip.main(["install", "--ignore-installed"] + sys.argv[1:]))' setuptools pip wheel
  File "/opt/circleci/python/2.7.11/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/requests/", line 447, in send
    raise SSLError(e, request=request)
SSLError: [Errno 20] Not a directory

The build links contain the full error messages. Debugging the build with a ssh connection and omitting the wheel package (–no-wheel) resulted in a successful virtualenv creation. I made a branch with a newer Python version in circle.yml, and it built successfully (build 216),