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diff --git a/generator/optgroups.ml b/generator/optgroups.ml
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+(* libguestfs
+ * Copyright (C) 2009-2012 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *)
+
+(* Please read generator/README first. *)
+
+open Types
+open Actions
+
+(* Create list of optional groups. *)
+let optgroups =
+  let h = Hashtbl.create 13 in
+  List.iter (
+    function
+    | { name = name; optional = Some group } ->
+      let names = try Hashtbl.find h group with Not_found -> [] in
+      Hashtbl.replace h group (name :: names)
+    | _ -> ()
+  ) daemon_functions;
+  let groups = Hashtbl.fold (fun k _ ks -> k :: ks) h [] in
+  let groups =
+    List.map (
+      fun group -> group, List.sort compare (Hashtbl.find h group)
+    ) groups in
+  List.sort (fun x y -> compare (fst x) (fst y)) groups