anchor.diff:  { lib, stdenv, fetchurl, pkg-config, libsamplerate, libsndfile, fftw
  -, vamp-plugin-sdk, ladspaH, meson, ninja }:
  +, vamp-plugin-sdk, ladspaH, meson, ninja, darwin }:
   
   stdenv.mkDerivation rec {
     pname = "rubberband";
  
positive.code:     # commercial license available as well, see homepage. You'll get some more optimized routines
      license = licenses.gpl2Plus;
      maintainers = [ maintainers.goibhniu maintainers.marcweber ];
      platforms = platforms.linux;
    };
  }
  
negative.code:   };
  
    nativeBuildInputs = [ pkg-config meson ninja ];
    buildInputs = [ libsamplerate libsndfile fftw vamp-plugin-sdk ladspaH ] ++ lib.optionals stdenv.isDarwin
      (with darwin.apple_sdk.frameworks; [Accelerate CoreGraphics CoreVideo]);
    makeFlags = [ "AR:=$(AR)" ];
  
    meta = with lib; {
  