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diff --git a/tactics/tactic_option.ml b/tactics/tactic_option.ml
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(* $Id: subtac.ml 12623 2010-01-04 17:50:38Z letouzey $ *)
+
+open Libobject
+open Proof_type
+open Pp
+
+let declare_tactic_option ?(default=Tacexpr.TacId []) name =
+  let default_tactic_expr : Tacexpr.glob_tactic_expr ref = ref default in
+  let default_tactic : Proof_type.tactic ref = ref (Tacinterp.eval_tactic !default_tactic_expr) in
+  let locality = ref false in
+  let set_default_tactic local t = 
+    locality := local;
+    default_tactic_expr := t; default_tactic := Tacinterp.eval_tactic t 
+  in
+  let cache (_, (local, tac)) = set_default_tactic local tac in
+  let load (_, (local, tac)) =
+    if not local then set_default_tactic local tac
+  in
+  let subst (s, (local, tac)) =
+    (local, Tacinterp.subst_tactic s tac)
+  in
+  let input, _output = 
+    declare_object
+      { (default_object name) with
+	cache_function = cache;
+	load_function = (fun _ -> load);
+	open_function = (fun _ -> load);
+	classify_function = (fun (local, tac) ->
+	  if local then Dispose else Substitute (local, tac));
+	subst_function = subst}
+  in
+  let put local tac =
+    set_default_tactic local tac;
+    Lib.add_anonymous_leaf (input (local, tac))
+  in
+  let get () = !locality, !default_tactic in
+  let print () = 
+    Pptactic.pr_glob_tactic (Global.env ()) !default_tactic_expr ++
+      (if !locality then str" (locally defined)" else str" (globally defined)")
+  in
+  let freeze () = !locality, !default_tactic_expr in
+  let unfreeze (local, t) = set_default_tactic local t in
+  let init () = () in
+    Summary.declare_summary name
+      { Summary.freeze_function = freeze;
+        Summary.unfreeze_function = unfreeze;
+        Summary.init_function = init };
+    put, get, print
+