anchor.diff:  # Install PyNE
   RUN git clone https://github.com/pyne/pyne.git \
       && cd pyne \
  -    && TAG=$(git describe --abbrev=0 --tags) \
  -    && git checkout tags/`echo ${TAG}` -b `echo ${TAG}` \
  +    && git checkout tags/0.7.7 -b 0.7.7 \
       && python setup.py install --user \
                                  --moab $HOME/opt/moab \
                                  --dagmc $HOME/opt/dagmc \
  
positive.code: 
  # Install OpenMC API
  RUN git clone https://github.com/openmc-dev/openmc.git \
      && cd openmc && git checkout develop \
      && mkdir bld && cd bld \
      && cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/.local \
      && make && make install \
  
negative.code: # build MOAB
  RUN mkdir moab \
      && cd moab \
      && git clone --branch 5.4.0 --single-branch --depth 1 https://bitbucket.org/fathomteam/moab moab \
      && mkdir build \
      && cd build \
      && cmake ../moab/ \
  