anchor.diff:  RUN add-apt-repository -y ppa:ubuntu-toolchain-r/ppa
   RUN apt-get update
   RUN apt-get install -y libcv-dev libcvaux-dev libhighgui-dev libopencv-dev
  -RUN curl -sL https://deb.nodesource.com/setup | bash -
  -RUN apt-get install -y nodejs
  -RUN npm install opencv@3.2.0 || cat npm-debug.log
   
   ENV JAVA_HOME /usr
   RUN echo 'PATH=$PATH:HOME/bin:$JAVA_HOME/bin' >> /etc/profile &&\
  
positive.code: COPY sudoers_silk /etc/sudoers.d/silk
  
  USER silk
  RUN ccache -M 6GB
  
  RUN ssh-keygen -q -N "" -t rsa -f /home/silk/.ssh/id_rsa
  RUN cp /home/silk/.ssh/id_rsa.pub /home/silk/.ssh/authorized_keys
  
negative.code: RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh | bash
  RUN bash -i -c 'nvm install 6'
  ENV NVM_DIR /home/silk/.nvm
  
  