anchor.diff:  , pkg-config
   , python3
   , docbook_xml_dtd_43
  -, docbook_xsl
  +, docbook-xsl-nons
   , libxslt
   , gettext
   , gnome3
  
positive.code:     owner = "GNOME";
      repo = pname;
      rev = version;
      sha256 = "L9CjhZ60F42xbo50x7cdKfJrav/9mf38pff8S4xkEVo=";
    };
  
    patches = [
      passthru.respect_xml_catalog_files_var_patch
    ];
  
    outputDevdoc = "out";
  
    nativeBuildInputs = [
      pkg-config
  
negative.code: 
  python3.pkgs.buildPythonApplication rec {
    pname = "gtk-doc";
    version = "1.33.2";
  
    outputDevdoc = "out";
  
    format = "other";
  
  