anchor.diff:  
   # Install OpenMC API
   RUN git clone https://github.com/openmc-dev/openmc.git \
  -    && cd openmc && git checkout develop \
  +    && cd openmc && git checkout tags/v0.12.2 -b v0.12.2 \
       && mkdir bld && cd bld \
       && cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/.local \
       && make && make install \
  
positive.code: ENV LD_LIBRARY_PATH $HOME/opt/moab/lib:$LD_LIBRARY_PATH
  ENV PYTHONPATH $HOME/opt/moab/lib/python3.8/site-packages/
  
  RUN mkdir dagmc \
      && cd dagmc \
      && git clone --branch develop --single-branch https://github.com/svalinn/DAGMC.git DAGMC \
      && cd DAGMC \
      && TAG=$(git describe --abbrev=0 --tags) \
      && git checkout tags/`echo ${TAG}` -b `echo ${TAG}` \
      && cd .. \
      && mkdir build \
      && cd build \
  
negative.code: # Install PyNE
  RUN git clone https://github.com/pyne/pyne.git \
      && cd pyne \
      && git checkout tags/0.7.7 -b 0.7.7 \
      && python setup.py install --user \
                                 --moab $HOME/opt/moab \
                                 --dagmc $HOME/opt/dagmc \
  