anchor.diff:  { stdenv, fetchurl, composableDerivation, unzip, libjpeg, libtiff, zlib
   , postgresql, mysql, libgeotiff, pythonPackages, proj, geos, openssl
  -, libpng, sqlite, libspatialite
  +, libpng, sqlite, libspatialite, poppler
   , libiconv
   , netcdfSupport ? true, netcdf, hdf5 , curl
   }:
  
positive.code:     "--with-jpeg=${libjpeg.dev}"
      "--with-libtiff=${libtiff.dev}" # optional (without largetiff support)
      "--with-png=${libpng.dev}"      # optional
      "--with-libz=${zlib.dev}"       # optional
      "--with-pg=${postgresql}/bin/pg_config"
      "--with-mysql=${mysql.lib.dev}/bin/mysql_config"
  
negative.code:     sha256 = "0jh7filpf5dk5iz5acj7y3y49ihnzqypxckdlj0sjigbqq6hlsmf";
    };
  
    buildInputs = [ unzip libjpeg libtiff libpng proj openssl sqlite
      libspatialite poppler ]
    ++ (with pythonPackages; [ python numpy wrapPython ])
    ++ stdenv.lib.optional stdenv.isDarwin libiconv
    ++ stdenv.lib.optionals netcdfSupport [ netcdf hdf5 curl ];
  