anchor.diff:  COPY --from=builder /usr/local /usr/local
   COPY --from=builder /opt/conda /opt/conda
   
  -RUN pip --no-cache-dir install cython ipython
  +#RUN pip --no-cache-dir install cython ipython
  +RUN pip --no-cache-dir install ipython
   
   WORKDIR /src
   
  
positive.code:     /src/legacypipe/py/{legacypipe,legacyzpts}
  
  # update legacypipe
  RUN cd /src/legacypipe && git pull && git checkout calib-container && git describe && \
    python    -m compileall /src/legacypipe/py/{legacypipe,legacyzpts} && \
    python -O -m compileall /src/legacypipe/py/{legacypipe,legacyzpts}
  
negative.code:     && python3 setup-cython.py --with-ceres install --home /usr/local \
      && make version && cp tractor/version.py /usr/local/lib/python/tractor/ \
      && rm -R $(find . -name "*.o" -o -name "*.so") \
      && (cd && PYTHONPATH=/usr/local/lib/python python3 -c "import tractor; print(tractor.__version__)") \
      && echo 1
  
  #RUN pip --no-cache-dir install fitsio==0.9.12
  RUN pip --no-cache-dir install git+https://github.com/esheldon/fitsio.git@fpack-in-filename
  
  ######## Stage 2 ########
  FROM registry.services.nersc.gov/nersc/intel_cxx_fort_mpi_mkl_runtime
  