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diff --git a/gcc/ada/libgnat/s-vercon.adb b/gcc/ada/libgnat/s-vercon.adb
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+++ b/gcc/ada/libgnat/s-vercon.adb
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+------------------------------------------------------------------------------
+--                                                                          --
+--                          GNAT RUN-TIME COMPONENTS                        --
+--                                                                          --
+--               S Y S T E M . V E R S I O N _ C O N T R O L                --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with System.Unsigned_Types; use System.Unsigned_Types;
+
+package body System.Version_Control is
+
+   ------------------------
+   -- Get_Version_String --
+   ------------------------
+
+   function Get_Version_String
+     (V    : System.Unsigned_Types.Unsigned)
+      return Version_String
+   is
+      S : Version_String;
+      D : Unsigned := V;
+      H : constant array (Unsigned range 0 .. 15) of Character :=
+            "0123456789abcdef";
+
+   begin
+      for J in reverse 1 .. 8 loop
+         S (J) := H (D mod 16);
+         D := D / 16;
+      end loop;
+
+      return S;
+   end Get_Version_String;
+
+end System.Version_Control;