anchor.diff:  { lib, stdenv, fetchurl, pkg-config, autoreconfHook, makeWrapper
  -, perlPackages, libxml2, libiconv }:
  +, perlPackages, libxml2, libintl }:
   
   stdenv.mkDerivation rec {
     pname = "hivex";
  
positive.code:   '';
  
    meta = with lib; {
      broken = stdenv.isDarwin;
      description = "Windows registry hive extraction library";
      license = licenses.lgpl2;
      homepage = "https://github.com/libguestfs/hivex";
      maintainers = with maintainers; [offline];
      platforms = platforms.linux ++ platforms.darwin;
    };
  }
  
negative.code:     libxml2
    ]
    ++ (with perlPackages; [ perl IOStringy ])
    ++ lib.optionals stdenv.isDarwin [ libintl ];
  
    postInstall = ''
      wrapProgram $out/bin/hivexregedit \
  