anchor.diff:      optionalString;
   
     channel = "1.42";
  -  version = "${channel}.0";
  +  version = "${channel}.2";
   in
   stdenv.mkDerivation rec {
     name = "pango-${version}";
  
positive.code:   src = fetchurl {
      url = "mirror://gnome/sources/pango/${channel}/${name}.tar.xz";
      hashOutput = false;
      sha256 = "9924d88a3dcedff753f0763814a1605307c5c9c931413b8b47ea7267d1b19446";
    };
  
    nativeBuildInputs = [
  
negative.code:     "-Denable_docs=false"  # gtk-doc
      "-Dgir=true"
    ];
  
    # preCheck = /* Fontconfig fails to load default config in test */
    #     optionalString doCheck ''
  