anchor.diff:      && pip install pyOpenSSL \
       && pip install ndg-httpsclient \
       && pip install pyasn1 \
  -    && pip install apache-airflow[crypto,celery,postgres,hive,jdbc,mysql]==$AIRFLOW_VERSION \
  +    && pip install apache-airflow[crypto,celery,postgres,hive,jdbc,mysql${AIRFLOW_DEPS:+,}${AIRFLOW_DEPS}]==${AIRFLOW_VERSION} \
       && pip install 'celery[redis]>=4.1.1,<4.2.0' \
  +    && if [ -n "${PYTHON_DEPS}" ]; then pip install ${PYTHON_DEPS}; fi \
       && apt-get purge --auto-remove -yqq $buildDeps \
       && apt-get autoremove -yqq --purge \
       && apt-get clean \
  
positive.code: USER airflow
  WORKDIR ${AIRFLOW_HOME}
  ENTRYPOINT ["/entrypoint.sh"]
  CMD ["webserver"] # set default arg for entrypoint
negative.code: # Airflow
  ARG AIRFLOW_VERSION=1.10.0
  ARG AIRFLOW_HOME=/usr/local/airflow
  ARG AIRFLOW_DEPS=""
  ARG PYTHON_DEPS=""
  ENV AIRFLOW_GPL_UNIDECODE yes
  
  # Define en_US.
  