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diff --git a/src/translate/grt/grt-c.ads b/src/translate/grt/grt-c.ads
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+--  GHDL Run Time (GRT) - C interface.
+--  Copyright (C) 2005 - 2014 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.
+
+--  This package declares C types.
+--  It is a really stripped down version of interfaces.C!
+with System;
+
+package Grt.C is
+   pragma Preelaborate (Grt.C);
+
+   --  Type void * and char *.
+   subtype voids is System.Address;
+   subtype chars is System.Address;
+   subtype long is Long_Integer;
+
+   --  Type size_t.
+   type size_t is mod 2 ** Standard'Address_Size;
+
+   --  Type int.  It is an alias on Integer for simplicity.
+   subtype int is Integer;
+
+   --  Low level memory management.
+   procedure Free (Addr : System.Address);
+   function Malloc (Size : size_t) return System.Address;
+   function Realloc (Ptr : System.Address; Size : size_t)
+                    return System.Address;
+
+private
+   pragma Import (C, Free);
+   pragma Import (C, Malloc);
+   pragma Import (C, Realloc);
+end Grt.C;