anchor.diff:  with stdenv.lib;
   
   stdenv.mkDerivation rec {
  -  name = "vapoursynth-${version}";
  +  pname = "vapoursynth";
     version = "R46";
   
     src = fetchFromGitHub {
  
positive.code: { stdenv, fetchFromGitHub, pkgconfig, autoreconfHook
  , zimg, libass, python3, libiconv
  , ApplicationServices, nasm
  , ocrSupport ?  false, tesseract ? null
  
negative.code: 
    enableParallelBuilding = true;
  
    postInstall = ''
      wrapProgram $out/bin/vspipe \
          --prefix PYTHONPATH : $out/${python3.sitePackages}
    '';
  
    meta = with stdenv.lib; {
      description = "A video processing framework with the future in mind";
      homepage    = http://www.vapoursynth.com/;
      license     = licenses.lgpl21;
      platforms   = platforms.x86_64;
      maintainers = with maintainers; [ rnhmjoj tadeokondrak ];
    };
  
  }
  