anchor.diff:  
     configureFlags =
       lib.optional stdenv.hostPlatform.sse4_1Support "--enable-sse41"
  -    ++ lib.optional stdenv.hostPlatform.avx2Support "--enable-avx2"
  -    ++ lib.optional stdenv.hostPlatform.isAarch64 "--enable-neon";
  +    ++ lib.optional stdenv.hostPlatform.avx2Support "--enable-avx2";
   
     installPhase = lib.optionalString (!withGtk) ''
       runHook preInstall
  
positive.code:     sha256 = "1kay7aj30x0vn8rkylspdycydrzsc0aidjbs0dd238hr5hid723b";
    };
  
    nativeBuildInputs = [
      pkg-config
    ]
    ++ lib.optionals withGtk [
      meson
  
negative.code: { lib
  , stdenv
  , alsa-lib
  , autoreconfHook
  , fetchFromGitHub
  , fetchpatch
  , gtkmm3
  , libepoxy
  , libpng
  