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diff --git a/ocamlbuild/shell.ml b/ocamlbuild/shell.ml
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+(***********************************************************************)
+(*                             ocamlbuild                              *)
+(*                                                                     *)
+(*  Nicolas Pouillard, Berke Durak, projet Gallium, INRIA Rocquencourt *)
+(*                                                                     *)
+(*  Copyright 2007 Institut National de Recherche en Informatique et   *)
+(*  en Automatique.  All rights reserved.  This file is distributed    *)
+(*  under the terms of the Q Public License version 1.0.               *)
+(*                                                                     *)
+(***********************************************************************)
+
+(* $Id$ *)
+(* Original author: Nicolas Pouillard *)
+open My_std
+
+let is_simple_filename s =
+  let ls = String.length s in
+  ls <> 0 &&
+  let rec loop pos =
+    if pos >= ls then true else
+    match s.[pos] with
+    | 'a'..'z' | 'A'..'Z' | '0'..'9' | '.' | '-' | '/' | '_' | ':' | '@' | '+' | ',' -> loop (pos + 1)
+    | _ -> false in
+  loop 0
+let quote_filename_if_needed s =
+  if is_simple_filename s then s else Filename.quote s
+let chdir dir =
+  reset_filesys_cache ();
+  Sys.chdir dir
+let run args =
+  reset_readdir_cache ();
+  let cmd = String.concat " " (List.map quote_filename_if_needed args) in
+  if !*My_unix.is_degraded || Sys.os_type = "Win32" then
+    begin
+      let st = sys_command cmd in
+      if st <> 0 then
+        failwith (Printf.sprintf "Error during command `%s'.\nExit code %d.\n" cmd st)
+      else
+        ()
+    end
+  else
+    match My_unix.execute_many ~ticker:Log.update ~display:Log.display [[(cmd, ignore)]] with
+    | None -> ()
+    | Some(_, x) ->
+      failwith (Printf.sprintf "Error during command %S: %s" cmd (Printexc.to_string x))
+let rm = sys_remove
+let rm_f x =
+  if sys_file_exists x then rm x
+let mkdir dir =
+  reset_filesys_cache_for_file dir;
+  (*Sys.mkdir dir (* MISSING in ocaml *) *)
+  run ["mkdir"; dir]
+let try_mkdir dir = if not (sys_file_exists dir) then mkdir dir
+let rec mkdir_p dir =
+  if sys_file_exists dir then ()
+  else (mkdir_p (Filename.dirname dir); mkdir dir)
+let cp = copy_file (* Décret du 2007-02-01 *)
+(*
+  let cp src dest =
+  reset_filesys_cache_for_file dest;
+  run["cp";"-pf";src;dest]*)
+let readlink = My_unix.readlink
+let is_link = My_unix.is_link
+let rm_rf x =
+  reset_filesys_cache ();
+  run["rm";"-Rf";x]
+let mv src dest =
+  reset_filesys_cache_for_file src;
+  reset_filesys_cache_for_file dest;
+  run["mv"; src; dest]
+  (*Sys.rename src dest*)