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diff --git a/src/grt/grt-zlib.ads b/src/grt/grt-zlib.ads
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+--  GHDL Run Time (GRT) - Zlib binding.
+--  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.
+
+with System; use System;
+with Grt.C; use Grt.C;
+
+package Grt.Zlib is
+   pragma Linker_Options ("-lz");
+
+   type gzFile is new System.Address;
+
+   NULL_gzFile : constant gzFile := gzFile (System'To_Address (0));
+
+   function gzputc (File : gzFile; C : int) return int;
+   pragma Import (C, gzputc);
+
+   function gzwrite (File : gzFile; Buf : voids; Len : int) return int;
+   pragma Import (C, gzwrite);
+
+   function gzopen (Path : chars; Mode : chars) return gzFile;
+   pragma Import (C, gzopen);
+
+   procedure gzclose (File : gzFile);
+   pragma Import (C, gzclose);
+end Grt.Zlib;