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diff --git a/src/grt/grt-vcdz.adb b/src/grt/grt-vcdz.adb
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+--  GHDL Run Time (GRT) - VCD .gz module.
+--  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.Storage_Elements; --  Work around GNAT bug.
+pragma Unreferenced (System.Storage_Elements);
+with Grt.Vcd; use Grt.Vcd;
+with Grt.Errors; use Grt.Errors;
+with Grt.Types; use Grt.Types;
+with Grt.Astdio; use Grt.Astdio;
+with Grt.Hooks; use Grt.Hooks;
+with Grt.Zlib; use Grt.Zlib;
+with Grt.C; use Grt.C;
+
+package body Grt.Vcdz is
+   Stream : gzFile;
+
+   procedure My_Vcd_Put (Str : String)
+   is
+      R : int;
+      pragma Unreferenced (R);
+   begin
+      R := gzwrite (Stream, Str'Address, Str'Length);
+   end My_Vcd_Put;
+
+   procedure My_Vcd_Putc (C : Character)
+   is
+      R : int;
+      pragma Unreferenced (R);
+   begin
+      R := gzputc (Stream, Character'Pos (C));
+   end My_Vcd_Putc;
+
+   procedure My_Vcd_Close is
+   begin
+      gzclose (Stream);
+      Stream := NULL_gzFile;
+   end My_Vcd_Close;
+
+   --  VCD filename.
+
+   --  Return TRUE if OPT is an option for VCD.
+   function Vcdz_Option (Opt : String) return Boolean
+   is
+      F : constant Natural := Opt'First;
+      Vcd_Filename : String_Access := null;
+      Mode : constant String := "wb" & NUL;
+   begin
+      if Opt'Length < 7 or else Opt (F .. F + 6) /= "--vcdgz" then
+         return False;
+      end if;
+      if Opt'Length > 7 and then Opt (F + 7) = '=' then
+         if Vcd_Close /= null then
+            Error ("--vcdgz: file already set");
+            return True;
+         end if;
+
+         --  Add an extra NUL character.
+         Vcd_Filename := new String (1 .. Opt'Length - 8 + 1);
+         Vcd_Filename (1 .. Opt'Length - 8) := Opt (F + 8 .. Opt'Last);
+         Vcd_Filename (Vcd_Filename'Last) := NUL;
+
+         Stream := gzopen (Vcd_Filename.all'Address, Mode'Address);
+         if Stream = NULL_gzFile then
+            Error_C ("cannot open ");
+            Error_E (Vcd_Filename (Vcd_Filename'First
+                                   .. Vcd_Filename'Last - 1));
+            return True;
+         end if;
+         Vcd_Putc := My_Vcd_Putc'Access;
+         Vcd_Put := My_Vcd_Put'Access;
+         Vcd_Close := My_Vcd_Close'Access;
+         return True;
+      else
+         return False;
+      end if;
+   end Vcdz_Option;
+
+   procedure Vcdz_Help is
+   begin
+      Put_Line
+        (" --vcdgz=FILENAME   dump signal values into a VCD gzip'ed file");
+   end Vcdz_Help;
+
+   Vcdz_Hooks : aliased constant Hooks_Type :=
+     (Option => Vcdz_Option'Access,
+      Help => Vcdz_Help'Access,
+      Init => Proc_Hook_Nil'Access,
+      Start => Proc_Hook_Nil'Access,
+      Finish => Proc_Hook_Nil'Access);
+
+   procedure Register is
+   begin
+      Register_Hooks (Vcdz_Hooks'Access);
+   end Register;
+end Grt.Vcdz;