anchor.diff:  
   # Install FPM
   RUN apt-get update \
  -    && apt-get -y --no-install-recommends install php7.1-fpm \
  +    && apt-get -y --no-install-recommends install php$PHP_VERSION-fpm \
       && apt-get clean \
       && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/doc/*
   
  
positive.code: RUN usermod -u 1000 www-data
  
  # PHP-FPM packages need a nudge to make them docker-friendly
  COPY overrides.conf /etc/php/7.1/fpm/pool.d/z-overrides.conf
  
  # PHP-FPM has really dirty logs, certainly not good for dockerising
  # The following startup script contains some magic to clean these up
  
negative.code: 
  # Fixes some weird terminal issues such as broken clear / CTRL+L
  ENV TERM=linux
  ENV PHP_VERSION 7.1
  
  # Install cURL and nano
  #RUN apt-get update \
  