anchor.diff:  { config, stdenv
   , mkDerivation
   , fetchFromGitHub
  +, addOpenGLRunpath
   , cmake
   , fdk_aac
   , ffmpeg
  
positive.code:     sha256 = "11hl3lxvbsm7ackl7qhzgy2x0jsz2dfpi2qxsf8pkp908lrh3b3r";
    };
  
    nativeBuildInputs = [ cmake pkgconfig ];
  
    buildInputs = [ curl
                    fdk_aac
  
negative.code:         --prefix "LD_LIBRARY_PATH" : "${xorg.libX11.out}/lib:${vlc}/lib"
    '';
  
    postFixup = stdenv.lib.optionalString stdenv.isLinux ''
        addOpenGLRunpath $out/lib/lib*.so
    '';
  
    meta = with stdenv.lib; {
      description = "Free and open source software for video recording and live streaming";
      longDescription = ''
  