anchor.diff:  
   ARG DEBIAN_FRONTEND=noninteractive
   RUN apt-get update \
  + && apt-get install -y \
  +      curl \
  + && curl -sL https://deb.nodesource.com/setup_14.x | bash - \
  + && apt-get update \
    && apt-get install -y \
         libcurl4-openssl-dev \
         libfontconfig1-dev \
  
positive.code: COPY . /code
  WORKDIR /code
  
  RUN npm install
  RUN make -C py setup
  
  # WIP: Skipping for now, until all system deps are determined and installed.
  # RUN make -C r setup
  
negative.code:       libjpeg-dev \
        libpng-dev \
        libssh2-1-dev \
        libssl-dev \
        libtiff5-dev \
        libxml2-dev \
        nodejs \
        pandoc \
        python3 \
        python3-pip \
        r-base \
  