anchor.diff:                  xz-utils \
                   zlib1g-dev \
                   git \
  +		libasound2 \
  + 		python-ply \
  +		libgl1-mesa-glx \
  +		libatk1.0-0 \
  +		libdbus-1-3 \
  +		libdbus-glib-1-2 \
  +		libgtk2.0-0 \
  +		libhunspell-1.3-0 \
  +		libstartup-notification0 \
  +		libxcomposite1 \
           && rm -rf /var/lib/apt/lists/*
   
   #install fake X server
  
positive.code: vim FROM ruby:2.3
  
  #set env variables
  ENV DISPLAY=":99.0" \
  
negative.code: RUN dpkg -i xserver-common_1.17.3-2_all.deb
  RUN dpkg -i xvfb_1.17.3-2_amd64.deb
  
  RUN wget http://security.debian.org/debian-security/pool/updates/main/i/iceweasel/iceweasel_38.6.0esr-1~deb8u1_amd64.deb
  RUN dpkg -i iceweasel_38.6.0esr-1~deb8u1_amd64.deb
  
  #RUN wget "https://ftp.mozilla.org/pub/firefox/releases/${FF_VERSION}/linux-x86_64/en-US/firefox-44.0.sdk.tar.bz2" \
  #    -O /tmp/firefox.tar.bz2 && \
  #    tar xvf /tmp/firefox.tar.bz2 -C /opt && \
  #    ln -s /opt/firefox/firefox /usr/bin/firefox
  
  # install xvfb init script
  COPY xvfb-run /usr/local/bin/
  