anchor.diff:  
   # 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 && \
  -    apt-get clean
  +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
  
positive.code:     nodejs \
      nodejs-legacy \
      npm
  
  # install js dependencies
  RUN npm install -g configurable-http-proxy
  
negative.code: RUN dpkg-reconfigure locales
  
  # Python binary dependencies, developer tools
  RUN apt-get install -y -q \
      build-essential \
      make \
      gcc \
  