anchor.diff:      owner = "harfbuzz";
       repo = "harfbuzz";
       rev = version;
  -    sha256 = "sha256-JnvOFGK2HWIpzuwgZtyt0IfKfnoXD1LMeVb3RzMmyY4=";
  +    sha256 = "107l9jhvwy6pnq5032kr7r21md65qg09j7iikr4jihf9pvh7gn5w";
     };
   
     postPatch = ''
  
positive.code:     docbook_xml_dtd_43
    ];
  
    buildInputs = [ glib freetype fontconfig ]
      ++ lib.optionals withCoreText [ ApplicationServices CoreText ]
      ++ lib.optionals isNativeCompilation [ gobject-introspection ];
  
  
negative.code:     # GUI-related libraries, so it shouldn't be re-added lightly.
      (mesonFeatureFlag "cairo" false)
      (mesonFeatureFlag "introspection" isNativeCompilation)
      # chafa is only used in a development utility, not in the library
      (mesonFeatureFlag "chafa" false)
    ];
  
    nativeBuildInputs = [
  