anchor.diff:      && make install INSTALL_DIR=/usr/local \
       && make clean \
       && (cd && PYTHONPATH=/usr/local/lib/python python3 -c "import astrometry; print(astrometry.__version__)") \
  -    && git describe && echo 0.85
  +    && git describe && echo 0.87
   
   # Pip installs -- binary.  We need cython for the tractor.
   RUN for x in \
  
positive.code: # The Tractor
  RUN git clone http://github.com/dstndstn/tractor.git tractor \
      && cd tractor \
      && git checkout dr9.6 \
      && 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") \
  
negative.code: 
  # Pip installs -- built from source
  RUN pip --no-cache-dir install photutils
  RUN pip --no-cache-dir install fitsio==1.1.5
  
  RUN /sbin/ldconfig
  
  