anchor.diff:  # install dev tools
   RUN apt-get update && apt-get upgrade -y && apt-get update && \
       apt-get install -y \
  -        # ca-certificates \
  -        # AXEL is the download accelerator
           axel curl tar sudo openssh-server openssh-client rsync \
  -        openjdk-7-jdk
  +        openjdk-7-jdk libyaml-dev \
  +        && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
   
   # hadoop
   ENV APACHE http://www.eu.apache.org
  
positive.code: # Live slideshows
  RUN wget -q https://github.com/pdonorio/RISE/archive/master.tar.gz \
      && tar xvzf *.gz && cd *master && \
      python setup.py install \
      && rm -rf /tmp/*.gz
  
  ###############################
  # New bootstrap?
  
negative.code: # JUPYTER RELATED
  
  # Dependencies
  RUN chown jovyan /opt
  # Main notebook user
  USER jovyan
  