anchor.diff:  # install user packages
   RUN yum -y install stow vim;\
   	yum clean all
  +
  +# clean up yum cruft if any
  +RUN rm -rf /var/cache/yum
  
positive.code: FROM centos:centos7
  LABEL maintainer="Michael West <Michael.West@cambiahealth.com>"
  
  # note that this can be used as a mustache template 
  # intention is to set proxy and set epel repository to use http
  # to support use as a Dockerfile mustache delimiter is hashtags instead of brackets 
  # because the delimiter is changed to get output that is not HTML escaped use 
  # delim, delim, ampersand, space, var, delim, delim
  # as described in the docs
  # https://mustache.github.io/mustache.5.html
  
negative.code: 
  # install development tools.  Just for compiling python we need more than half of them.
  # this was my first Dockerfile.  Now I understand taht installing a group like this is not best practice
  # install only what you need.  I've lost track of exactly what I need now.  Try taking this out and see what
  # failed due to missing dependencies.  I think I will be missing some python compile dependencies.
  #RUN yum groups mark install "Development Tools";\
  #	yum groups mark convert "Development Tools";\
  