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diff --git a/ocamlbuild/hooks.ml b/ocamlbuild/hooks.ml
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+(***********************************************************************)
+(* ocamlbuild *)
+(* *)
+(* Nicolas Pouillard, Berke Durak, projet Gallium, INRIA Rocquencourt *)
+(* *)
+(* Copyright 2007 Institut National de Recherche en Informatique et *)
+(* en Automatique. All rights reserved. This file is distributed *)
+(* under the terms of the Q Public License version 1.0. *)
+(* *)
+(***********************************************************************)
+
+(* $Id$ *)
+(* Original author: Nicolas Pouillard *)
+type message =
+ | Before_hygiene
+ | After_hygiene
+ | Before_options
+ | After_options
+ | Before_rules
+ | After_rules
+
+let hooks = ref ignore
+
+let setup_hooks f = hooks := f
+
+let call_hook m = !hooks m