anchor.diff:      "--with-python"               # optional
       "--with-static-proj4=${proj}" # optional
       "--with-geos=${geos}/bin/geos-config"# optional
  +    "--with-hdf4=${hdf4.dev}" # optional
       (if netcdfSupport then "--with-netcdf=${netcdf}" else "")
     ];
   
  
positive.code: { stdenv, fetchurl, composableDerivation, unzip, libjpeg, libtiff, zlib
  , postgresql, mysql, libgeotiff, pythonPackages, proj, geos, openssl
  , libpng, sqlite, libspatialite, poppler
  , libiconv
  , netcdfSupport ? true, netcdf, hdf5 , curl
  }:
  
negative.code:   };
  
    buildInputs = [ unzip libjpeg libtiff libpng proj openssl sqlite
      libspatialite poppler hdf4 ]
    ++ (with pythonPackages; [ python numpy wrapPython ])
    ++ stdenv.lib.optional stdenv.isDarwin libiconv
    ++ stdenv.lib.optionals netcdfSupport [ netcdf hdf5 curl ];
  
    hardeningDisable = [ "format" ];
  
    # - Unset CC and CXX as they confuse libtool.
    # - teach gdal that libdf is the legacy name for libhdf
    preConfigure = ''
        unset CC CXX
        substituteInPlace configure \
        --replace "-lmfhdf -ldf" "-lmfhdf -lhdf"
      '';
  
    configureFlags = [
      "--with-jpeg=${libjpeg.dev}"
  