anchor.diff:      docbook_xml_dtd_43
     ];
   
  -  buildInputs = [ glib freetype fontconfig ]
  +  buildInputs = [ glib freetype ]
       ++ lib.optionals withCoreText [ ApplicationServices CoreText ]
       ++ lib.optionals isNativeCompilation [ gobject-introspection ];
   
  
positive.code:     # GUI-related libraries, so it shouldn't be re-added lightly.
      (mesonFeatureFlag "cairo" false)
      (mesonFeatureFlag "introspection" isNativeCompilation)
    ];
  
    nativeBuildInputs = [
  
negative.code: }:
  
  let
    version = "2.8.1";
    inherit (lib) optional optionals optionalString;
    mesonFeatureFlag = opt: b:
      "-D${opt}=${if b then "enabled" else "disabled"}";
  