anchor.diff:           qalc \
            locales \
            dnsutils \
  +         libssl-dev \
  +         build-essential \
            python3-dnspython \
  +         python3-dev \
            python3-openssl \
            python3-pip \
            python3-cffi \
  
positive.code:     && echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen \
      && locale-gen \
      && pip3 install virtualenv \
  	&& rm -rf /var/lib/apt/lists/*
  
  RUN mkdir /srv/data /srv/plugins /srv/errbackends /app \
  
negative.code: 
  COPY requirements.txt /app/requirements.txt
  
  RUN virtualenv /app/venv
  RUN . /app/venv/bin/activate; pip install --no-cache-dir -r /app/requirements.txt
  
  COPY config.py /app/config.py
  COPY run.sh /app/venv/bin/run.sh
  