anchor.diff:  
   ENV PYTHONPATH /usr/local/lib/python:/src/unwise_psf/py:/src/legacypipe/py
   ENV WISE_PSF_DIR /src/unwise_psf/etc
  -
  -RUN pip3 install --no-cache-dir ipython
   
   ENV HOME /root
   
  
positive.code:            /usr/local/lib/python /usr/local/lib/python3.5/site-packages \
             /usr/local/lib/python3.5/dist-packages
  
  RUN cd /src/legacypipe/py && git pull && git describe && echo 15
  
  RUN    python    -m compileall /src/legacypipe/py/{legacypipe,legacyzpts} \
      && python -O -m compileall /src/legacypipe/py/{legacypipe,legacyzpts}
  
negative.code:     matplotlib \
      astropy \
      zmq \
      ; do pip3 --no-cache-dir install $x; done
  
  # ugly: Tractor's mp_fourier module detects the $CC='icc' exactly
  # These are in /opt/intel/bin, which is on the PATH.
  ENV CC icc
  ENV CXX icpc
  ENV LDSHARED icc -shared
  # Edison & Cori
  #ENV CFLAGS -O3 -g -fPIC -std=gnu99 -pthread -x=ivybridge -ax=haswell,knl
  # Just Cori
  ENV CFLAGS -O3 -g -fPIC -std=gnu99 -pthread -x=haswell -ax=knl
  ENV ARCH_FLAGS ""
  
  # Pip installs -- built from source
  RUN for x in \
      photutils \
      fitsio \
      ; do pip3 --no-cache-dir install $x; done
  
  ENV PYTHON python3
  ENV PYTHON_CONFIG python3-config
  