anchor.diff:  
   # Install pip packages.
   
  -RUN source /etc/profile.d/desi.sh \
  -    && pip install --no-binary :all: \
  +RUN pip install --no-binary :all: \
       fitsio \
       speclite \
       iniparser \
  
positive.code: 
  # Install BOOST.
  
  RUN source /etc/profile.d/desi.sh \
      && curl -SL https://sourceforge.net/projects/boost/files/boost/1.62.0/boost_1_62_0.tar.bz2/download \
      -o boost_1_62_0.tar.bz2 \
      && tar xjf boost_1_62_0.tar.bz2 \
      && cd boost_1_62_0 \
  
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 \
  