anchor.diff:  
   # Clone and install Embree
   RUN if [ "$include_dagmc" = "true" ] ; \
  -    then git clone https://github.com/embree/embree.git ; \
  +    then git clone --single-branch --branch master https://github.com/embree/embree.git ; \
       cd embree ; \
       mkdir build ; \
       cd build ; \
  
positive.code: 
  # Clone and install Double-Down
  RUN if [ "$include_dagmc" = "true" ] ; \
      then git clone https://github.com/pshriwise/double-down.git ; \
      cd double-down ; \
      mkdir build ; \
      cd build ; \
  
negative.code: RUN if [ "$include_dagmc" = "true" ] ; \
      then mkdir DAGMC ; \
      cd DAGMC ; \
      git clone --single-branch --branch develop develop https://github.com/svalinn/DAGMC.git ; \
      mkdir build ; \
      cd build ; \
      cmake ../DAGMC -DBUILD_TALLY=ON \
                     -DCMAKE_INSTALL_PREFIX=/DAGMC/ \
                     -DMOAB_DIR=/usr/local \
                     -DBUILD_STATIC_LIBS=OFF \
                     -DBUILD_STATIC_EXE=OFF ; \
      make -j"$compile_cores" install ; \
      rm -rf /DAGMC/DAGMC /DAGMC/build ; \
      fi
  
  # Clone and install OpenMC with DAGMC
  