anchor.diff:  
   # Install remaining dependencies
   RUN apt update && apt install --no-install-recommends gcc gnupg2 libgomp1 liblzma-dev libbz2-dev libpq-dev \
  -                                                      mercurial make netcat python-dev python-setuptools python-pip \
  +                                                      mercurial make netcat python3-dev python3-setuptools python3-pip \
                                                         zlib1g-dev -y \
  -    && pip install Cython wheel \
  -    && pip install pysam \
  +    && pip3 install Cython wheel \
  +    && pip3 install pysam \
       && /usr/bin/common_cleanup.sh
   
   # GALAXY_USER should be able to run docker without root permissions
  
positive.code: FROM build_base as build_galaxy
  COPY ./files/common_cleanup.sh /usr/bin/common_cleanup.sh
  # Install Galaxy
  RUN apt update && apt install --no-install-recommends python-dev python-pip -y && rm -rf /var/lib/apt/lists/* \
      && export GALAXY_PYTHON=/usr/bin/python \
      && mkdir "${GALAXY_ROOT}" \
      && curl -L -s $GALAXY_REPO/archive/$GALAXY_RELEASE.tar.gz | tar xzf - --strip-components=1 -C $GALAXY_ROOT \
      && cd $GALAXY_ROOT \
      && ./scripts/common_startup.sh \
      && . $GALAXY_ROOT/.venv/bin/activate && pip install psycopg2 \
      # Fix as cheetah was missing C library first
      && pip uninstall cheetah -y \
      && pip install cheetah drmaa \
      && deactivate \
      && rm -rf .ci .circleci .coveragerc .gitignore .travis.yml CITATION CODE_OF_CONDUCT.md CONTRIBUTING.md CONTRIBUTORS.md \
                LICENSE.txt Makefile README.rst SECURITY_POLICY.md pytest.ini tox.ini \
  
negative.code: 
  ENV EXPORT_DIR=/export \
      GALAXY_ROOT=/galaxy \
      HTCONDOR_ROOT=/opt/htcondor
  
  ENV GALAXY_RELEASE=${GALAXY_RELEASE:-release_19.05} \
      GALAXY_REPO=${GALAXY_REPO:-https://github.com/galaxyproject/galaxy} \
  