anchor.diff:      nodejs \
       nodejs-legacy \
       npm
  +RUN apt-get clean
   
   # install js dependencies
   RUN npm install -g configurable-http-proxy
  
positive.code: RUN dpkg-reconfigure locales
  
  # Python binary dependencies, developer tools
  RUN apt-get update && apt-get install -y -q \
      build-essential \
      make \
      gcc \
  
negative.code: 
  # Not essential, but wise to set the lang
  # Note: Users with other languages should set this in their derivative image
  RUN apt-get update && apt-get install -y language-pack-en 
  ENV LANGUAGE en_GB.UTF-8
  ENV LANG en_GB.UTF-8
  ENV LC_ALL en_GB.UTF-8
  