anchor.diff:      yum clean all
   
   # install rerun
  -RUN rpm -Uvh http://dl.bintray.com/rerun/rerun-rpm/rerun-1.3.4-1.el6.noarch.rpm
  +RUN rpm -Uvh http://dl.bintray.com/rerun/rerun-rpm/rerun-$RERUNVER.noarch.rpm
   
   # compile and install discount markdown library
  -ENV DISCOUNTVER 2.1.8a
   ENV DISCOUNTURL http://www.pell.portland.or.us/~orc/Code/discount/discount-$DISCOUNTVER.tar.bz2
   RUN wget $DISCOUNTURL && \
       tar jxf discount-$DISCOUNTVER.tar.bz2 && \
  
positive.code: 
  FROM centos:6
  MAINTAINER Luke Heidecke <luke@solinea.com>
  
  ENV APPDIR /app
  WORKDIR $APPDIR
  
negative.code:     yum clean all
  
  # install pygments
  RUN pip install pygments==$PYGMENTSVER
  
  # environment variables
  ENV PATH ${PATH}:$APPDIR/bin
  