anchor.diff:  
   # Install zlib
   RUN cd /tmp && \
  -    wget ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-4/zlib-1.2.8.tar.gz && \
  +    wget https://www.unidata.ucar.edu/downloads/netcdf/ftp/netcdf-4/zlib-1.2.8.tar.gz && \
       tar xvf zlib-1.2.8.tar.gz && \
       cd zlib-1.2.8 && \
       ./configure && \
  
positive.code: 
  # Install netcdf-cxx
  RUN cd /tmp && \
      wget http://www.unidata.ucar.edu/downloads/netcdf/ftp/netcdf-cxx4-4.2.tar.gz && \
      tar xvf netcdf-cxx4-4.2.tar.gz && \
      cd netcdf-cxx4-4.2 && \
      ./configure --prefix=/usr/local && \
  
negative.code: 
  # Install netcdf
  RUN cd /tmp && \
      wget https://www.unidata.ucar.edu/downloads/netcdf/ftp/netcdf-4.1.3.tar.gz && \
      tar xvf netcdf-4.1.3.tar.gz && \
      cd netcdf-4.1.3 && \
      ./configure --prefix=/usr/local && \
  