anchor.diff:          libproj-dev \
           locales \
           postgresql-client \
  -        python3-virtualenv \
           rsync \
           runit-init \
           vim \
  +        nodejs \
  +        npm \
           wait-for-it && \
       apt-get clean && \
           rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  
positive.code: # Install `pip` packages. #
  ###########################
  
  RUN virtualenv "$VIRTUAL_ENV"
  ENV PATH="$VIRTUAL_ENV/bin:$PATH"
  RUN pip install  --quiet --upgrade pip && \
      pip install  --quiet pip-tools
  
negative.code: FROM python:3.8
  
  ENV DEBIAN_FRONTEND=noninteractive
  ENV LANG=en_US.UTF-8
  