anchor.diff:  # CSS Janus is the thing actually used to generate the rtl css.
   # Pandoc is used for rendering wikicode resource descriptions
   # into html for display. We do need this on the live image.
  -RUN apt install -y \
  +RUN apt update ; \
  +    apt install -y --no-install-recommends \
       bash \
       gettext \
       git \
  
positive.code: FROM quay.io/wikipedialibrary/debian:buster-slim as twlight_base
  # Base dependencies.
  RUN apt update; \
      apt install -y \
      libjpeg62-turbo \
      libxslt1-dev \
      libmariadb-dev \
      python3 \
      python3-pip ; \
      pip3 install virtualenv
  
  FROM twlight_base as twlight_build
  
negative.code:     pandoc \
      tar \
      wget ; \
      rm -rf /var/lib/apt/lists/*; \
      /usr/bin/npm install cssjanus
  
  # Utility scripts that run in the virtual environment.
  COPY bin /app/bin/
  