diff --git a/compiler/minils/ctrln/ctrlNbacGen.ml b/compiler/minils/ctrln/ctrlNbacGen.ml
index b3fa780..b9e6aa3 100644
--- a/compiler/minils/ctrln/ctrlNbacGen.ml
+++ b/compiler/minils/ctrln/ctrlNbacGen.ml
@@ -562,11 +562,25 @@ let requal_declared_types prog =
   let cmodul = controller_modul prog.p_modname in
   let requal m = m = prog.p_modname in
 
-  let requal_it ({ qual; name } as cstr) =
+  let requal_constr ({ qual; name } as cstr) =
     if requal qual then { qual = cmodul; name } else cstr in
 
-  let requal_type = function
-    | Tid { qual; name } when requal qual -> Tid { qual = cmodul; name }
+  let requal_type_dec = function
+    | { t_name = tn; t_desc = Type_enum cl } as t when requal tn.qual ->
+        let tn' = { tn with qual = cmodul } in
+        let t = { t with t_name = tn; t_desc = Type_alias (Tid tn') } in
+        Modules.replace_type tn (Signature.Talias (Tid tn'));
+        Modules.add_type tn' (Signature.Tenum (List.map requal_constr cl));
+        t
+    | _ -> raise Errors.Fallback
+  in
+
+  let requal_type = function                    (* requalify only enum types. *)
+    | Tid ({ qual; name } as ty) as t when requal qual ->
+        begin match Modules.find_type ty with
+          | Tenum _ -> Tid { qual = cmodul; name }
+          | _ -> t
+        end
     | t -> t
   in
 
@@ -574,31 +588,21 @@ let requal_declared_types prog =
   let open Global_mapfold in
   let funcs = { Mls_mapfold.defaults with
 
-    type_dec = (fun _ () -> function
-      | { t_name = tn; t_desc = Type_enum cl } as t when requal tn.qual ->
-          let tn' = requal_it tn in
-          let t = { t with
-            t_name = tn';
-            t_desc = Type_alias (Tid { qual = cmodul; name = tn.name});
-          } in
-          Modules.replace_type tn (Signature.Talias (Tid tn));
-          Modules.add_type tn' (Signature.Tenum (List.map requal_it cl));
-          t, ()
-      | _ -> raise Errors.Fallback);
+    type_dec = (fun _ () td -> requal_type_dec td, ());
 
     edesc = (fun funs () -> function
       | Ewhen (e, c, x) ->
-          Ewhen (exp_it funs () e |> fst, requal_it c,
+          Ewhen (exp_it funs () e |> fst, requal_constr c,
                  var_ident_it funs.global_funs () x |> fst), ()
       | Emerge (i, l) ->
           Emerge (var_ident_it funs.global_funs () i |> fst,
-                  List.map (fun (c, x) -> requal_it c,
+                  List.map (fun (c, x) -> requal_constr c,
                     extvalue_it funs () x |> fst) l), ()
       | _ -> raise Errors.Fallback);
 
     extvalue_desc = (fun funs () -> function
       | Wwhen (w, c, v) ->
-          Wwhen (extvalue_it funs () w |> fst, requal_it c,
+          Wwhen (extvalue_it funs () w |> fst, requal_constr c,
                  var_ident_it funs.global_funs () v |> fst), ()
       | _ -> raise Errors.Fallback);
 
@@ -608,12 +612,12 @@ let requal_declared_types prog =
 
       ck = (fun funs () -> function
         | Clocks.Con (ck, c, i) ->
-            Clocks.Con (ck_it funs () ck |> fst, requal_it c,
+            Clocks.Con (ck_it funs () ck |> fst, requal_constr c,
                         var_ident_it funs () i |> fst), ()
         | _ -> raise Errors.Fallback);
 
       static_exp_desc = (fun _ () -> function
-        | Sconstructor c -> Sconstructor (requal_it c), ()
+        | Sconstructor c -> Sconstructor (requal_constr c), ()
         | _ -> raise Errors.Fallback);
 
     };
diff --git a/compiler/minils/mls_mapfold.ml b/compiler/minils/mls_mapfold.ml
index 15bf88f..24f2845 100644
--- a/compiler/minils/mls_mapfold.ml
+++ b/compiler/minils/mls_mapfold.ml
@@ -188,9 +188,9 @@ and contract funs acc c =
   let c_local, acc = var_decs_it funs acc c.c_local in
   let c_eq, acc = eqs_it funs acc c.c_eq in
   { c with
-      c_assume = c_assume; 
+      c_assume = c_assume;
       c_enforce = c_enforce;
-      c_assume_loc = c_assume_loc; 
+      c_assume_loc = c_assume_loc;
       c_enforce_loc = c_enforce_loc;
       c_local = c_local;
       c_eq = c_eq }
@@ -221,7 +221,9 @@ and const_dec funs acc c =
   { c with c_type = ty; c_value = se }, acc
 
 
-and type_dec_it funs acc t = funs.type_dec funs acc t
+and type_dec_it funs acc t =
+  try funs.type_dec funs acc t
+  with Fallback -> type_dec funs acc t
 and type_dec funs acc t =
   let tdesc, acc = tdesc_it funs acc t.t_desc in
     { t with t_desc = tdesc }, acc
diff --git a/compiler/utilities/global/compiler_utils.ml b/compiler/utilities/global/compiler_utils.ml
index 277552d..f0c5eef 100644
--- a/compiler/utilities/global/compiler_utils.ml
+++ b/compiler/utilities/global/compiler_utils.ml
@@ -61,18 +61,18 @@ let comment ?(sep=separateur) s =
 
 let info: ('a, Format.formatter, unit, unit, unit, unit) format6 -> 'a = fun f ->
   if !verbose then
-    Format.kfprintf (fun f -> Format.kfprintf (fun f -> Format.pp_print_newline f ()) f)
-      Format.err_formatter "Info: " f
+    Format.kfprintf (Format.kfprintf (fun fmt -> Format.fprintf fmt "@]@."))
+      Format.err_formatter "Info: @[" f
   else
     Format.ifprintf Format.err_formatter f
 
 let warn: ('a, Format.formatter, unit, unit, unit, unit) format6 -> 'a = fun f ->
-  Format.kfprintf (fun f -> Format.kfprintf (fun f -> Format.pp_print_newline f ()) f)
-    Format.err_formatter "Warning: " f
+  Format.kfprintf (Format.kfprintf (fun fmt -> Format.fprintf fmt "@]@."))
+    Format.err_formatter "Warning: @[" f
 
 let error: ('a, Format.formatter, unit, unit, unit, unit) format6 -> 'a = fun f ->
-  Format.kfprintf (fun f -> Format.kfprintf (fun f -> Format.pp_print_newline f ()) f)
-    Format.err_formatter "Error: " f
+  Format.kfprintf (Format.kfprintf (fun fmt -> Format.fprintf fmt "@]@."))
+    Format.err_formatter "Error: @[" f
 
 let do_pass d f p pp =
   comment (d ^ " ...\n");
diff --git a/configure.in b/configure.in
index 9394f81..a9c64fe 100644
--- a/configure.in
+++ b/configure.in
@@ -63,6 +63,7 @@ AC_CHECK_OCAML_PKG([lablgtk2])
     AC_MSG_WARN([Could not find 'lablgtk2'. The simulator will not be built])
  fi
 
+dnl version should be >= 0.9.6
 AC_CHECK_OCAML_PKG([reatk.ctrlNbac])
  if test "${OCAML_PKG_reatk_ctrlNbac}" = "no"; then
    package_reatk_ctrlNbac="ocaml"; #dummy flag
diff --git a/heptc b/heptc
index 73f5aea..f0c14ce 100755
--- a/heptc
+++ b/heptc
@@ -42,7 +42,7 @@ fi
 if [ ! -e "$LIB_DIR/pervasives.epci" ] || [ "$HEPTC" -nt "$LIB_DIR/pervasives.epci" ]
 then
   pushd "$LIB_DIR" > /dev/null
-  echo "Recompile pervasives.epci"
+  echo "Recompile pervasives.epci" > /dev/stderr
   "$HEPTC" -nopervasives pervasives.epi
   popd > /dev/null
 fi