anchor.diff:  ENV DEBIAN_FRONTEND noninteractive
   
   # Installing the environment required: xserver, xdm, flux box, roc-filer and ssh
  -RUN apt-get install -y lxde-core lxterminal xvfb x11vnc sudo
  +# and install some basic packages
  +# and clean up apt-get
   
  +RUN apt-get update -y && \
  +	apt-get upgrade -y && \
  +	apt-get install -y lxde-core lxterminal xvfb x11vnc sudo && \
  +	apt-get install -y firefox xterm && \
  +	apt-get clean
   
   # Fix problems with Upstart and DBus inside a docker container.
   RUN dpkg-divert --local --rename --add /sbin/initctl && ln -sf /bin/true /sbin/initctl
   
  -# Install some basic packages
  -RUN apt-get install -y firefox xterm
  -
   # Copy the files into the container
   ADD . /x11-src
   RUN chmod -R a=rX /x11-src
  -
  -# Clean up apt-get
  -RUN apt-get clean
   
   # Local user, may be overwritten by dependent build
   ENV X11_USER xclient
  
positive.code: # Resolution and color depth of simulated display
  ENV RESOLUTION 1280x1024x16
  
  WORKDIR /home/${X11_USER} 
  VOLUME /home/${X11_USER}
  EXPOSE 5900
  
  # Start x11vnc
  
negative.code: FROM ubuntu:14.04
  MAINTAINER Stefan Schwetschke "stefan@schwetschke.de"
  
  ENV REFRESHED_APT_AT 2015-01-18
  
  # Set locale to UTF-8 to fix the locale warnings
  RUN localedef -v -c -i en_US -f UTF-8 en_US.UTF-8 || :
  