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