anchor.diff:  # Define additional metadata for our image.
   VOLUME /var/lib/docker
   
  -# Create virtualenv to link dependancies 
  +# Create virtualenv to link dependancies
   RUN pip install virtualenv && virtualenv .
  -# Install python dependancies 
  +# Install python dependancies
   RUN pip install -r requirements.txt
   
   RUN mkdir -p /var/log/docker /var/log/supervisor
  
positive.code:     build-essential \
      tcl8.5 \
      wget \
      libgcrypt11-dev \ 
      zlib1g-dev \
  	apt-transport-https \
      ca-certificates \
  
negative.code: # Install Redis
  RUN wget http://download.redis.io/releases/redis-stable.tar.gz && tar xzf redis-stable.tar.gz
  WORKDIR /opt/redis-stable
  RUN make && make install
  WORKDIR /opt/TangoService/Tango/
  
  # Install Docker from Docker Inc. repositories.
  