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diff --git a/src/synth/netlists-folds.ads b/src/synth/netlists-folds.ads
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+++ b/src/synth/netlists-folds.ads
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+--  Highler level API to build a netlist - do some optimizations.
+--  Copyright (C) 2019 Tristan Gingold
+--
+--  This file is part of GHDL.
+--
+--  This program is free software; you can redistribute it and/or modify
+--  it under the terms of the GNU General Public License as published by
+--  the Free Software Foundation; either version 2 of the License, or
+--  (at your option) any later version.
+--
+--  This program is distributed in the hope that it will be useful,
+--  but WITHOUT ANY WARRANTY; without even the implied warranty of
+--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+--  GNU General Public License for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with this program; if not, write to the Free Software
+--  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+--  MA 02110-1301, USA.
+
+with Netlists.Builders; use Netlists.Builders;
+
+package Netlists.Folds is
+   --  Build a const from VAL.  Result is either a Const_UB32 or a Const_Bit.
+   function Build2_Const_Uns (Ctxt : Context_Acc; Val : Uns64; W : Width)
+                             return Net;
+
+   --  Build a const from VAL.  Result is either a Const_SB32 or a Const_Bit.
+   function Build2_Const_Int (Ctxt : Context_Acc; Val : Int64; W : Width)
+                             return Net;
+
+   function Build2_Const_Vec (Ctxt : Context_Acc; W : Width; V : Uns32_Arr)
+                             return Net;
+
+   --  Concatenate nets of ELS in reverse order.  So if ELS(L .. R), then
+   --  ELS(L) will be at offset 0.
+   function Build2_Concat (Ctxt : Context_Acc; Els : Net_Array) return Net;
+
+   --  Zero extend, noop or truncate I so that its width is W.
+   function Build2_Uresize (Ctxt : Context_Acc;
+                            I : Net;
+                            W : Width;
+                            Loc : Location_Type := No_Location)
+                           return Net;
+   --  Same as Build_Extract, but return I iff extract all the bits.
+   function Build2_Extract
+     (Ctxt : Context_Acc; I : Net; Off, W : Width) return Net;
+end Netlists.Folds;