anchor.diff:  
   # Clone and install Double-Down
   RUN if [ "$include_dagmc" = "true" ] ; \
  -    then git clone https://github.com/pshriwise/double-down ; \
  +    then git clone https://github.com/pshriwise/double-down.git ; \
       cd double-down ; \
       mkdir build ; \
       cd build ; \
  
positive.code: RUN if [ "$include_dagmc" = "true" ] ; \
      then mkdir DAGMC ; \
      cd DAGMC ; \
      git clone -b develop https://github.com/svalinn/dagmc ; \
      mkdir build ; \
      cd build ; \
      cmake ../dagmc -DBUILD_TALLY=ON \
  
negative.code:     mkdir MOAB ; \
      cd MOAB ; \
      mkdir build ; \
      git clone  --single-branch --branch develop https://bitbucket.org/fathomteam/moab.git ; \
      cd build ; \
      cmake ../moab -DENABLE_HDF5=ON \
                    -DENABLE_NETCDF=ON \
  