anchor.diff:  , gobject-introspection
   , harfbuzz_lib
   , libx11
  +, libxft
   , libxrender
  -, xorg
   }:
  -
  -assert libx11 != null ->
  -  xorg.libXft != null;
   
   let
     inherit (lib)
       optionals
       optionalString;
   
  -  versionMajor = "1.40";
  -  versionMinor = "11";
  -  version = "${versionMajor}.${versionMinor}";
  +  channel = "1.40";
  +  version = "${channel}.13";
   in
   stdenv.mkDerivation rec {
     name = "pango-${version}";
   
     src = fetchurl {
  -    url = "mirror://gnome/sources/pango/${versionMajor}/${name}.tar.xz";
  +    url = "mirror://gnome/sources/pango/${channel}/${name}.tar.xz";
       hashOutput = false;
  -    sha256 = "5b11140590e632739e4151cae06b8116160d59e22bf36a3ccd5df76d1cf0383e";
  +    sha256 = "f84e98db1078772ff4935b40a1629ff82ef0dfdd08d2cbcc0130c8c437857196";
     };
   
     nativeBuildInputs = [
  
positive.code:         outputHash
          outputHashAlgo
          urls;
        sha256Url = "https://download.gnome.org/sources/pango/${versionMajor}/"
          + "${name}.sha256sum";
        failEarly = true;
      };
  
negative.code:     gobject-introspection
      harfbuzz_lib
      libx11
      libxft
      libxrender
    ];
  
    mesonFlags = [
  