anchor.diff:  
   RUN mkdir /homedir && chmod 777 /homedir
   ENV HOME /homedir
  -
  -# Handy to be able to run a Jupyter notebook (eg at NERSC)
  -RUN pip install ipykernel
   
   # set prompt and default shell
   SHELL ["/bin/bash", "-c"]
  
positive.code:     && make extra \
      && make install INSTALL_DIR=/usr/local \
      && make clean \
      && (cd && PYTHONPATH=/usr/local/lib/python python3 -c "import astrometry; print(astrometry.__version__)")
  
  # Pip installs -- binary.  We need cython for the tractor.
  RUN for x in \
  
negative.code:     /src/legacypipe/py/{legacypipe,legacyzpts}
  
  # update legacypipe
  RUN cd /src/legacypipe && git pull && git describe && echo 966 && \
    python    -m compileall /src/legacypipe/py/{legacypipe,legacyzpts} && \
    python -O -m compileall /src/legacypipe/py/{legacypipe,legacyzpts}
  
  