anchor.diff:      && cd tractor \
       && export PYTHON=python3 \
       && export PYTHON_CONFIG=python3-config \
  -    && make \
  -    && make ceres \
  -    && make install INSTALL_DIR=/usr/local \
  +    && 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")
   
   # QDO
  
positive.code:     && make py \
      && make extra \
      && make install INSTALL_DIR=/usr/local \
      && make clean && echo up
  
  # The Tractor
  RUN cd /src \
  
negative.code: FROM ubuntu:20.04
  
  RUN apt -y update && apt install -y apt-utils
  
  RUN DEBIAN_FRONTEND=noninteractive \
      apt install -y --no-install-recommends \
      gcc \
      g++ \
      make \
      git \
      file \
      pkg-config \
  