anchor.diff:  
   # Install EVERYTHING
   RUN apt-get update && \
  -    apt-get install --yes --no-install-recommends apt-utils && \ 
  -    apt-get install --yes --no-install-recommends \
  -            apt-transport-https \
  +    apt-get install --yes --no-install-recommends apt-utils && \
  +    apt-get install --yes --no-install-recommends apt-transport-https \
               biber \
               ca-certificates \
               dos2unix \
  
positive.code:             php7.1-xml && \
      apt-get --yes autoclean && \
      apt-get --purge --yes autoremove && \
      cabal update && \
      cabal install \
      pandoc \
      pandoc-citeproc \
      pandoc-citeproc-preamble \
      pandoc-crossref && \
      wget -q -O /tmp/kindlegen.tar.gz https://kindlegen.s3.amazonaws.com/kindlegen_linux_2.6_i386_v2_9.tar.gz && \
      cd /tmp && \
      tar -zxvf kindlegen.tar.gz && \
      mv /tmp/kindlegen /usr/local/bin && \
      cd /tmp && \
      wget -q http://download.gna.org/wkhtmltopdf/0.12/0.12.3/wkhtmltox-0.12.3_linux-generic-amd64.tar.xz && \
      xz -d wkhtmltox-0.12.3_linux-generic-amd64.tar.xz && \
      tar -xf wkhtmltox-0.12.3_linux-generic-amd64.tar && \
      mv wkhtmltox/bin/* /usr/local/bin/ && \
      cd /tmp && \
      rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* 
  
  #
  # Move BuildBook into place.
  
negative.code: FROM haskell:latest
  MAINTAINER Cal Evans <cal@calevans.com>
  
  # Set to Non-Interactive
  