anchor.diff:  ENV MDL_VERSION=0.5.0
   ENV AWESOMEBOT_VERSION=1.19.1
   
  -RUN apt-get -y update
  -RUN apt-get -y install build-essential zlib1g-dev libssl-dev
  +RUN apt-get -y update && apt-get -y install --no-install-recommends \
  +    build-essential \
  +    libssl-dev \
  +    zlib1g-dev
   
   ADD https://cache.ruby-lang.org/pub/ruby/2.6/ruby-${RUBY_VERSION}.tar.gz /tmp
   WORKDIR /tmp
  
positive.code: FROM ubuntu:xenial as nodejs_tools_context
  
  ENV NODEJS_VERSION=12.8.0
  
  ADD https://nodejs.org/download/release/v${NODEJS_VERSION}/node-v${NODEJS_VERSION}-linux-x64.tar.gz /tmp
  RUN tar -xzf /tmp/node-v${NODEJS_VERSION}-linux-x64.tar.gz --strip-components=1 -C /usr/local
  
negative.code: RUN tar -xzf /tmp/node-v${NODEJS_VERSION}-headers.tar.gz --strip-components=1 -C /usr/local
  
  RUN npm init -y
  RUN npm install --production --global \
      sass@${SASS_VERSION} \
      sass-lint@${SASS_LINT_VERSION} \
      typescript@${TYPESCRIPT_VERSION} \
      tslint@${TSLINT_VERSION} \
      markdown-spellcheck@${MARKDONN_SPELLCHECK_VERSION} \
      svgstore-cli@${SVGSTORE_CLI_VERSION} \
      svgo@${SVGO_VERSION}
  
  RUN npm install --production --global \
      @babel/core@${BABEL_CORE_VERSION} \
      @babel/cli@${BABEL_CLI_VERSION} \
      @babel/preset-env@${BABEL_PRESET_ENV_VERSION} \
      babel-preset-minify@${BABEL_PRESET_MINIFY_VERSION}
  RUN npm install --save @babel/polyfill
  
  #############
  # Ruby
  