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diff --git a/src/grt/grt-dynload.ads b/src/grt/grt-dynload.ads
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+--  GHDL Run Time (GRT) - Dynamically loaded modules.
+--  Copyright (C) 2019 Tristan Gingold
+--
+--  GHDL 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, or (at your option) any later
+--  version.
+--
+--  GHDL 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 GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+--
+--  As a special exception, if other files instantiate generics from this
+--  unit, or you link this unit with other files to produce an executable,
+--  this unit does not by itself cause the resulting executable to be
+--  covered by the GNU General Public License. This exception does not
+--  however invalidate any other reasons why the executable file might be
+--  covered by the GNU Public License.
+
+with System; use System;
+with Grt.Types; use Grt.Types;
+
+package Grt.Dynload is
+   function Grt_Dynload_Open (Path : Ghdl_C_String) return Address;
+   pragma Import (C, Grt_Dynload_Open);
+
+   function Grt_Dynload_Symbol (Handle : Address; Symbol : Ghdl_C_String)
+                               return Address;
+   pragma Import (C, Grt_Dynload_Symbol);
+
+   function Grt_Dynload_Error return Ghdl_C_String;
+   pragma Import (C, Grt_Dynload_Error);
+end Grt.Dynload;