anchor.diff:    inherit (stdenv.lib)
       boolEn;
   
  -  version = "0.14.0";
  +  version = "0.13.7";
   in
   stdenv.mkDerivation rec {
     name = "libass-${version}";
  
positive.code: , fribidi
  , harfbuzz_lib
  
  , largeTilesSupport ? false # Use larger tiles in the rasterizer
  }:
  
  
negative.code:   src = fetchurl {
      url = "https://github.com/libass/libass/releases/download/${version}/"
        + "${name}.tar.xz";
      sha256 = "7065e5f5fb76e46f2042a62e7c68d81e5482dbeeda24644db1bd066e44da7e9d";
    };
  
    nativeBuildInputs = [
  