anchor.diff:  , pkg-config
   , gettext
   , python3
  -, libxslt
  -, docbook-xsl-nons
  -, docbook_xml_dtd_43
  +, docutils
   , gi-docgen
   , glib
   , libtiff
  
positive.code:     gobject-introspection
  
      # for man pages
      libxslt
      docbook-xsl-nons
      docbook_xml_dtd_43
    ] ++ lib.optionals stdenv.isDarwin [
      fixDarwinDylibNames
    ];
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "gdk-pixbuf";
    version = "2.42.9";
  
    outputs = [ "out" "dev" "man" "devdoc" ]
      ++ lib.optional (stdenv.buildPlatform == stdenv.hostPlatform) "installedTests";
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
      sha256 = "KPeVjnvymjLU6WNVbSQdCkGmeGWC/2pa0RZl4DR/yWI=";
    };
  
    patches = [
  