anchor.diff:      django-ipware \
       django-encrypted-fields \
       django_rest_swagger \
  +    python-dateutil \
       python-keyczar \
       pygraphviz \
       dnslib \
  
positive.code:     libxslt1.1 \
      libxslt1-dev \
      libyaml-dev \
      nginx \
      openssh-client \
      python-dev \
  
negative.code: 
  
  # install Tosca engine
  RUN bash /opt/xos/tosca/install_tosca.sh
  
  # configure nginx
  