anchor.diff:  FROM debian:stable
   
   ENV RUBY_MAJOR 2.2
  -ENV RUBY_VERSION 2.2.0
  +ENV RUBY_VERSION 2.2.6
   
   RUN echo 'gem: --no-document --no-rdoc --no-ri' > /etc/gemrc
   
  
positive.code: #  compiling from source because don't want the dependencys of x11 (alternative to apt-get install libvips-dev)
  #  apt-get install libglib2.0-0 libxml2 libexif12 libjpeg8 libtiff5 libpng12-0 liblcms2-2 liborc-0.4-0 libfftw3-3
  RUN    mkdir -p /tmp/vips \
      && curl -L http://www.vips.ecs.soton.ac.uk/supported/current/vips-7.42.1.tar.gz | tar -xzC /tmp/vips --strip-components=1  \
      && cd /tmp/vips \
      && ./configure --disable-docs \
      && make \
  
negative.code: 
  
  
  # vips, imagemagic and their dependencys consumes ~500MB !? :( so compiling them.
  # Install build dependencys for imagemagic and vips
  RUN    apt-get update -qq \
      && DEBIAN_FRONTEND=noninteractive apt-get install -qq pkg-config libglib2.0-dev libxml2-dev libexif-dev libjpeg8-dev libtiff5-dev libpng12-dev liblcms2-dev liborc-0.4-dev libfftw3-dev \
  