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diff --git a/src/synth/synth-source.ads b/src/synth/synth-source.ads
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+--  Source/origin of synthesis.
+--  Copyright (C) 2017 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 Iirs; use Iirs;
+
+package Synth.Source is
+   subtype Syn_Src is Iir;
+   No_Syn_Src : constant Syn_Src := Null_Iir;
+end Synth.Source;