anchor.diff:  RUN echo "deb http://packages.osrfoundation.org/gazebo/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/gazebo-latest.list \
       && curl http://packages.osrfoundation.org/gazebo.key |apt-key add - \
       && aptitude update -y -q \
  -    && aptitude remove -y -q gazebo2 \
  -    && aptitude install -y -q -R gazebo7
  +    && aptitude remove -y -q gazebo2
   
   # install essential tools
   RUN aptitude install -y -q -R  bash-completion wget vim git terminator supervisor xauth openssh-server sudo pcmanfm \
  
positive.code:     \
  # install orocos rtt components
      && aptitude install -y -q -R ros-indigo-orocos-kdl ros-indigo-rtt ~nros-indigo-rtt-*
  
  # install RoboWare
  RUN aptitude install -y -q -R  python-pip pylint clang libnss3 libnotify4 \
  
negative.code: 
  # install ros related components
  RUN aptitude install -y -q -R ros-indigo-moveit-full \
      ros-indigo-ros-controllers \
      ros-indigo-controller-manager \
      ros-indigo-rqt-controller-manager \
  