anchor.diff:          mkisofs \
           openjdk-7-jdk \
           openssh-server \
  +        protobuf-compiler \
  +        python-dev \
           python-pip \
           python-virtualenv \
           texinfo \
  +        unzip \
  +        vim \
  +        wget \
           xmlstarlet \
  -        zip
  +        zip && \
  +    rm -rf /var/lib/apt/lists/*
   
   # Install node v6.9.1
   RUN wget -q https://nodejs.org/dist/v6.9.1/node-v6.9.1-linux-x64.tar.gz && \
  
positive.code:     ssh-keyscan -H localhost >> ~/.ssh/known_hosts && \
      ssh-keyscan -H github.com >> ~/.ssh/known_hosts && \
      cp /home/silk/.ssh/id_rsa.pub /home/silk/.ssh/authorized_keys
  
  
negative.code:     mv ninja /usr/bin && \
      chmod +x /usr/bin/ninja && \
      pip install ninja-syntax
  
  # Install python packages
  RUN pip install --upgrade pip && \
      pip install matplotlib numpy scipy
  
  ENV JAVA_HOME /usr
  RUN echo 'PATH=$PATH:HOME/bin:$JAVA_HOME/bin' >> /etc/profile && \
  