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diff --git a/helm/software/lambda-delta/src/lib/log.mli b/helm/software/lambda-delta/src/lib/log.mli
new file mode 100644
index 000000000..9e0f054e1
--- /dev/null
+++ b/helm/software/lambda-delta/src/lib/log.mli
@@ -0,0 +1,63 @@
+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.              
+     \ /   This software is distributed as is, NO WARRANTY.              
+      V_______________________________________________________________ *)
+
+type ('a, 'b) item = Term of 'a * 'b
+                   | LEnv of 'a
+                   | Warn of string
+		   | String of string
+		   | Loc
+
+type ('a, 'b) message = ('a, 'b) item list
+
+type ('a, 'b) specs = {
+   pp_term: 'a -> Format.formatter -> 'b -> unit;
+   pp_lenv: Format.formatter -> 'a -> unit
+}
+
+val loc: string ref
+
+val level: int ref
+
+val clear: unit -> unit
+
+val warn: string -> unit
+
+val box: int -> unit
+
+val unbox: int -> unit
+
+val flush: int -> unit
+
+val box_err: unit -> unit
+
+val flush_err: unit -> unit
+
+val log: ('a, 'b) specs -> int -> ('a, 'b) message -> unit
+
+val error: ('a, 'b) specs -> ('a, 'b) message -> unit
+
+val items1: string -> ('a, 'b) message
+
+val t_items1: string -> 'a -> 'b -> ('a, 'b) message
+
+val et_items1:
+   string -> 'a -> string -> 'b -> ('a, 'b) message
+
+val et_items2:
+   string -> 'a -> string -> 'b -> 
+   ?sc2:string -> ?c2:'a -> string -> 'b -> 
+   ('a, 'b) message
+
+val et_items3:
+   string -> 'a -> string -> 'b -> 
+   ?sc2:string -> ?c2:'a -> string -> 'b -> 
+   ?sc3:string -> ?c3:'a -> string -> 'b ->
+   ('a, 'b) message