anchor.diff:  
   RUN cd /src/legacypipe/py && git pull && git describe && echo 4
   
  -#RUN pip3 install cython
  
positive.code:     git \
      file \
      pkg-config \
      wget \
      netpbm \
      wcslib-dev \
  
negative.code:     fitsio \
      zmq \
      ; do pip3 install $x; done \
      && rm -Rf /root/.cache/pip \
      && echo 1
  
  ENV PYTHON python3
  