anchor.diff:          -es",^[[:blank:]]*prefix[[:blank:]]*=.*$,prefix = $out,g"
     '';
   
  -  meta = {
  +  meta = with stdenv.lib; {
       description = "A GPS photo correlation tool, to add EXIF geotags";
   
       longDescription = ''
  
positive.code:       one takes the GPS data in a different format.
      '';
  
      license = stdenv.lib.licenses.gpl2Plus;
  
      homepage = http://freefoote.dview.net/linux_gpscorr.html;
      platforms = stdenv.lib.platforms.linux;
    };
  }
  
negative.code: { fetchFromGitHub, stdenv, pkgconfig, exiv2, libxml2, gtk2
  , libxslt, docbook_xsl, docbook_xml_dtd_42 }:
  
  stdenv.mkDerivation rec {
    name = "gpscorrelate-${version}";
    version = "1.6.1";
  
    src = fetchFromGitHub {
      owner = "freefoote";
      repo = "gpscorrelate";
      rev = version;
      sha256 = "1z0fc75rx7dl6nnydksa578qv116j2c2xs1czfiijzxjghx8njdj";
    };
  
    nativeBuildInputs = [ pkgconfig ];
    buildInputs = [
      exiv2 libxml2 gtk2
      libxslt docbook_xsl 
      docbook_xml_dtd_42
    ];
  
    patchPhase = ''
  