anchor.diff:  
   # Install any needed packages specified in requirements.txt
   RUN pip install -r requirements.txt
  +RUN yum install -y libSM libXext libXrender
   
   # Clean all installed packages
   RUN yum clean all
  
positive.code: # EXPOSE port 80 to allow communication to/from server
  EXPOSE 80
  
  # CMD specifcies the command to execute to start the server running.
  #CMD ["/usr/sbin/httpd", "-D", "FOREGROUND"]
  #CMD ["bash", "-c", "/usr/sbin/init"]
  ENTRYPOINT ["/usr/sbin/httpd", "-D", "FOREGROUND"]
negative.code: # FROM directive instructing base image to build upon
  FROM centos:7
  
  