anchor.diff: -{ stdenv, fetchurl, pkgconfig, libxml2, sqlite, zlib, proj, geos }:
  +{ stdenv, fetchurl, pkgconfig, libxml2, sqlite, zlib, proj, geos, libiconv }:
   
   stdenv.mkDerivation rec {
     name = "libspatialite-4.2.0";
  
positive.code:     sha256 = "0b9ipmp09y2ij7yajyjsh0zcwps8n5g88lzfzlkph33lail8l4wz";
    };
  
    buildInputs = [ pkgconfig libxml2 sqlite zlib proj geos ];
  
    configureFlags = "--disable-freexl";
  
  
negative.code:     homepage = https://www.gaia-gis.it/fossil/libspatialite;
      # They allow any of these
      license = with licenses; [ gpl2Plus lgpl21Plus mpl11 ];
      platforms = platforms.unix;
    };
  }
  