anchor.diff:      rm /var/lib/apt/lists/*_*
   
   # Install node
  -RUN mkdir /nodejs && curl https://nodejs.org/dist/v5.7.1/node-v5.7.1-linux-x64.tar.gz | tar xvzf - -C /nodejs --strip-components=1
  +RUN mkdir /nodejs && curl https://nodejs.org/dist/v6.4.0/node-v6.4.0-linux-x64.tar.gz | tar xvzf - -C /nodejs --strip-components=1
   ENV PATH /nodejs/bin:$PATH
   
   # Install rbenv
  
positive.code: ENV NOKOGIRI_USE_SYSTEM_LIBRARIES 1
  
  # Temporarily replace ImageMagick policy file with one that fixes
  # CVE-2016-3714
  RUN mkdir -p /etc/ImageMagick-6 && rm -f /etc/ImageMagick-6/policy.xml
  COPY files/policy.xml /etc/ImageMagick-6/
  
  
negative.code:     rbenv global $V; \
      done
  
  # Preinstall bundler gem
  ENV BUNDLER_VERSION 1.12.5
  RUN for V in $PREINSTALLED_RUBY_VERSIONS; do \
      RBENV_VERSION=$V gem install -q --no-rdoc --no-ri bundler --version $BUNDLER_VERSION; \
      rbenv rehash; \
      done
  # Tell nokogiri >=1.6 to install using system libraries, for faster builds
  