anchor.diff:  
   USER root
   RUN apt-get update &&\
  -    apt-get -y install apache2 libapache2-mod-php7.0 php7.0-pgsql graphviz
  +    apt-get -y install apache2 libapache2-mod-php7.0 php7.0-pgsql graphviz libgraph-easy-perl
   
   CMD /bin/bash /opt/provsql/docker/demo.sh
   EXPOSE 80
  
positive.code: 
  # TOOL dsharp
  RUN cd /tmp/ &&\
      hg clone https://bitbucket.org/haz/dsharp &&\
      cd dsharp &&\
      mv Makefile_gmp Makefile &&\
      make &&\
      mv dsharp /tmp/tools/ &&\
      chmod a+x /tmp/tools/dsharp
      
  # mv the additional tools
  RUN bash -c "mv /tmp/tools/* /usr/local/bin"
  
negative.code: ENV PSQL_VERSION=$PSQL_VERSION
  
  RUN apt-get update &&\
      apt-get -y install zlib1g-dev postgresql-${PSQL_VERSION} postgresql-server-dev-${PSQL_VERSION} postgresql-contrib-${PSQL_VERSION}
  
  # Ensure a sane environment
  ENV LANG=C.UTF-8 LC_ALL=C.UTF-8 DEBIAN_FRONTEND=noninteractive
  