anchor.diff:          --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 = ''
  
positive.code:     sha256 = "11hl3lxvbsm7ackl7qhzgy2x0jsz2dfpi2qxsf8pkp908lrh3b3r";
    };
  
    nativeBuildInputs = [ cmake pkgconfig ];
  
    buildInputs = [ curl
                    fdk_aac
  
negative.code: { config, stdenv
  , mkDerivation
  , fetchFromGitHub
  , addOpenGLRunpath
  , cmake
  , fdk_aac
  , ffmpeg
  