anchor.diff:        libssl-dev
   
   # Workaround for zipp import error issue - https://github.com/pypa/virtualenv/issues/1630
  -RUN python3 -m pip install --upgrade pip
  +RUN python3.8 -m pip install --upgrade pip
   
   RUN set -e && \
  -    python3 -m pip install --no-cache-dir "tox==3.20.1"
  +    python3.8 -m pip install --no-cache-dir "tox==3.25.1"
   
   COPY . /libcloud
   
  +RUN if [ ! -f "/libcloud/README.rst" ]; then echo "libcloud/README.rst file not found, you are likely not running docker build from the repository root directory"; exit 1; fi
  +
   WORKDIR /libcloud
   
  -CMD ["tox", "-e", "lint,py3.5,py3.6,py3.7,py3.8,pypypy3"]
  +CMD ["tox", "-e", "lint,black-check,py3.6,py3.7,py3.8,py3.9,py3.10,pypypy3"]
  
positive.code:     add-apt-repository ppa:pypy/ppa && \
      apt-get update && \
      apt-get -y install \
        python3.5 \
        python3.6 \
        python3.7 \
        python3.8 \
        python-dev \
        python3.5-dev \
        python3.6-dev \
        python3.7-dev \
        python3.8-dev \
        pypy3 \
        pypy3-dev \
        python3-pip \
  
negative.code: 
  # Docker image used for running tests the under all the supported Python
  # versions
  FROM ubuntu:20.04
  
  RUN set -e && \
      apt-get update && \
  