anchor.diff:  ARG SLURM_TAG=slurm-18-08-3-1
   ARG PYTHON_VERSIONS="2.6 2.7 3.4 3.5 3.6"
   
  -RUN yum makecache fast \
  +RUN set -ex \
  +    && yum makecache fast \
       && yum -y install epel-release \
       && yum -y install \
           autoconf \
  
positive.code:     && yum clean all \
      && rm -rf /var/cache/yum
  
  RUN set -x \
      && wget https://www.python.org/ftp/python/2.6.9/Python-2.6.9.tgz \
      && tar xzf Python-2.6.9.tgz \
      && pushd Python-2.6.9 \
  
negative.code: 
  RUN for version in $PYTHON_VERSIONS; do pip$version install Cython nose; done
  
  RUN set -ex \
      && git clone https://github.com/SchedMD/slurm.git \
      && pushd slurm \
      && git checkout tags/$SLURM_TAG \
  