anchor.diff:  }:
   
   let
  -  inherit (stdenv.lib)
  -    enFlag;
  +  inherit (lib)
  +    boolEn;
   
     version = "230";
   in
  -
   stdenv.mkDerivation rec {
     name = "libgudev-${version}";
   
     src = fetchurl {
  -    url = "https://download.gnome.org/sources/libgudev/${version}/${name}.tar.xz";
  -    sha256 = "063w6j35n0i0ssmv58kivc1mw4070z6fzb83hi4xfrhcxnn7zrx2";
  +    url = "mirror://gnome/sources/libgudev/${version}/${name}.tar.xz";
  +    sha256 = "a2e77faced0c66d7498403adefcc0707105e03db71a2b2abd620025b86347c18";
     };
   
     buildInputs = [
  
positive.code:     "--disable-gtk-doc"
      "--disable-gtk-doc-html"
      "--disable-gtk-doc-pdf"
      (enFlag "introspection" (gobject-introspection != null) null)
    ];
  
    meta = with stdenv.lib; {
      description = "GObject bindings for udev";
      homepage = https://wiki.gnome.org/Projects/libgudev;
      license = licenses.lgpl2Plus;
  
negative.code: { stdenv
  , fetchurl
  , lib
  
  , glib
  , gobject-introspection
  