anchor.diff:  
   # Install build tools
   RUN apt-get update && apt-get install -y\
  -    oracle-java7-unlimited-jce-policy\
  -    build-essential\
  +    bzip2\
       unzip\
       git\
       libfontconfig\
  
positive.code: FROM flurdy/oracle-java7
  
  # Setup teamcity-agent and his data dir
  RUN adduser --disabled-password --gecos "" teamcity-agent &&\
  
negative.code: 
  # this one needs to match our host's remote api version
  ENV DOCKER_API_VERSION 1.21
  ENV DOCKER_VERSION 1.12.6
  RUN curl -L https://get.docker.com/builds/Linux/x86_64/docker-$DOCKER_VERSION \
      > /usr/local/bin/docker && \
    chmod +x /usr/local/bin/*
  
  
  # Install phantomjs
  ENV PHANTOMJS phantomjs-2.1.1-linux-x86_64
  RUN curl -Ls https://bitbucket.org/ariya/phantomjs/downloads/$PHANTOMJS.tar.bz2\
      | tar --strip=2 -jxC /usr/bin $PHANTOMJS/bin/phantomjs
  
  # Install node version manager
  USER teamcity-agent
  RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | sh
  USER root
  
  # prepare docker-in-docker (with some sane defaults here,
  