anchor.diff:  in
   stdenv.mkDerivation rec {
     pname = "mkvtoolnix";
  -  version = "70.0.0";
  +  version = "71.1.0";
   
     src = fetchFromGitLab {
       owner = "mbunkus";
       repo = "mkvtoolnix";
       rev = "release-${version}";
  -    sha256 = "sha256-7ryLf/SKM5m7MdOd2K2XhJEdLF2H8xjV1aZMKUjm+Ok=";
  +    sha256 = "sha256-JHbnjcXOctB6HQeHXykWbykdn35S2fCYegMkc3GLmAI=";
     };
   
     nativeBuildInputs = [
  
positive.code: { lib
  , stdenv
  , fetchFromGitLab
  , pkg-config
  , autoreconfHook
  , rake
  
negative.code:     "--disable-profiling"
      "--disable-static-qt"
      "--enable-optimization"
      "--with-boost-libdir=${lib.getLib boost}/lib"
      "--with-docbook-xsl-root=${docbook_xsl}/share/xml/docbook-xsl"
      "--with-gettext"
      (enableFeature withGUI "gui")
  