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diff --git a/plugins/extraction/ExtrOcamlBasic.v b/plugins/extraction/ExtrOcamlBasic.v
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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        *)
+(************************************************************************)
+
+(** Extraction to Ocaml : use of basic Ocaml types *)
+
+Extract Inductive bool => bool [ true false ].
+Extract Inductive option => option [ Some None ].
+Extract Inductive unit => unit [ "()" ].
+Extract Inductive list => list [ "[]" "( :: )" ].
+Extract Inductive prod => "( * )" [ "" ].
+
+(** NB: The "" above is a hack, but produce nicer code than "(,)" *)
+
+(** Mapping sumbool to bool and sumor to option is not always nicer,
+    but it helps when realizing stuff like [lt_eq_lt_dec] *)
+
+Extract Inductive sumbool => bool [ true false ].
+Extract Inductive sumor => option [ Some None ].
+
+(** Restore lazyness of andb, orb.
+    NB: without these Extract Constant, andb/orb would be inlined
+    by extraction in order to have lazyness, producing inelegant
+    (if ... then ... else false) and (if ... then true else ...).
+*)
+
+Extract Inlined Constant andb => "(&&)".
+Extract Inlined Constant orb => "(||)".
+