anchor.diff:      "--disable-precompiled-headers"
       "--disable-static-qt"
       "--with-gettext"
  +    "--with-docbook-xsl-root=${docbook_xsl}/share/xml/docbook-xsl"
       (enableFeature withGUI "qt")
     ];
   
  
positive.code: { stdenv, fetchFromGitHub, pkgconfig, autoconf, automake
  , drake, ruby, file, xdg_utils, gettext, expat, qt5, boost
  , libebml, zlib, libmatroska, libogg, libvorbis, flac
  , withGUI ? true
  }:
  
  
negative.code: 
  stdenv.mkDerivation rec {
    name = "mkvtoolnix-${version}";
    version = "9.9.0";
  
    src = fetchFromGitHub {
      owner = "mbunkus";
      repo = "mkvtoolnix";
      rev = "release-${version}";
      sha256 = "1jiz23s52l3gpl84yx4yw3w445jqzcimvnvibvrv3a21k29hyik1";
    };
  
    nativeBuildInputs = [ pkgconfig autoconf automake gettext drake ruby docbook_xsl libxslt ];
  
    buildInputs = [
      expat file xdg_utils boost libebml zlib libmatroska libogg
  