anchor.diff:  
   COPY desi_versions.txt /usr/local/
   
  -RUN source /etc/profile.d/desi.sh \
  -    && git clone https://github.com/tskisner/desibuild.git \
  +RUN git clone https://github.com/tskisner/desibuild.git \
       && ./desibuild/desi_source /usr/local/desi_versions.txt \
  -    && ./desibuild/desi_setup -p /usr/local -v /usr/local/desi_versions.txt \
  +    && ./desibuild/desi_setup -c -p /usr/local -v /usr/local/desi_versions.txt \
       && rm -rf desi*
   
  -# Set the entrypoint so that all commands executed with "docker run"
  -# will first start a bash login shell (so that /etc/profile is sourced).
  +# Set the entrypoint and default command
   
  -ENTRYPOINT ["/bin/bash", "-l", "-c"]
  +ENTRYPOINT ["/bin/bash", "-c"]
   CMD ["/bin/bash"]
   
  
positive.code:     && apt-get install -y curl procps build-essential gfortran git \
      && rm -fr /var/lib/apt/lists/*
  
  # Add conda location to global bash environment.  We
  # add the conda library and include directories to our
  # environment as well, since we will be installing
  # compatible MKL headers and using the conda MKL install
  
negative.code: 
  # Install CFITSIO.
  
  RUN curl -SL http://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio3410.tar.gz \
      -o cfitsio3410.tar.gz \
      && tar xzf cfitsio3410.tar.gz \
      && cd cfitsio \
  