anchor.diff:      sha256 = "1bakbr714j7yxdal1f5iq0gcl4cxggbbgj227ihdh5kvygqlwich";
     };
   
  -  nativeBuildInputs = [ cmake pkgconfig ];
  +  nativeBuildInputs = [ cmake pkg-config ];
     buildInputs = [ ffmpeg_3 libpng libjpeg ];
  +  cmakeFlags = [ "-DENABLE_THUMBNAILER=ON" ];
   
     meta = with stdenv.lib;  {
       homepage = "https://github.com/dirkvdb/ffmpegthumbnailer";
       description = "A lightweight video thumbnailer";
  -    longDescription = "FFmpegthumbnailer is a lightweight video 
  +    longDescription = "FFmpegthumbnailer is a lightweight video
           thumbnailer that can be used by file managers to create thumbnails
           for your video files. The thumbnailer uses ffmpeg o decode frames
           from the video files, so supported videoformats depend on the
  
positive.code: { fetchFromGitHub, stdenv, ffmpeg_3, cmake, libpng, pkgconfig, libjpeg
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:         The only dependencies are ffmpeg and libpng.
      ";
      platforms = platforms.linux;
      license = licenses.gpl2Plus;
      maintainers = [ maintainers.jagajaga ];
    };
  
  