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diff --git a/clib/bigint.mli b/clib/bigint.mli
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+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+(** Arbitrary large integer numbers *)
+
+type bigint
+
+val of_string : string -> bigint
+(** May raise a Failure just as [int_of_string] on non-numerical strings *)
+
+val to_string : bigint -> string
+
+val of_int : int -> bigint
+val to_int : bigint -> int (** May raise a Failure on oversized numbers *)
+
+val zero : bigint
+val one : bigint
+val two : bigint
+
+val div2_with_rest : bigint -> bigint * bool (** true=odd; false=even *)
+val add_1 : bigint -> bigint
+val sub_1 : bigint -> bigint
+val mult_2 : bigint -> bigint
+
+val add : bigint -> bigint -> bigint
+val sub : bigint -> bigint -> bigint
+val mult : bigint -> bigint -> bigint
+
+(** Euclid division m/d = (q,r), with m = q*d+r and |r|<|q|.
+    This is the "Trunc" variant (a.k.a "Truncated-Toward-Zero"),
+    as with ocaml's / (but not as ocaml's Big_int.quomod_big_int).
+    We have sign r = sign m *)
+
+val euclid : bigint -> bigint -> bigint * bigint
+
+val less_than : bigint -> bigint -> bool
+val equal : bigint -> bigint -> bool
+
+val is_strictly_pos : bigint -> bool
+val is_strictly_neg : bigint -> bool
+val is_pos_or_zero : bigint -> bool
+val is_neg_or_zero : bigint -> bool
+val neg : bigint -> bigint
+
+val pow : bigint -> int -> bigint