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diff --git a/lib/systemdirs.ml b/lib/systemdirs.ml
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+++ b/lib/systemdirs.ml
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(* $Id$ *)
+
+open Unix
+
+type unix_path = string (* path in unix-style, with '/' separator *)
+
+type file_kind =
+  | FileDir of unix_path * (* basename of path: *) string 
+  | FileRegular of string (* basename of file *)
+
+(* Copy of Filename.concat but assuming paths to always be POSIX *)
+
+let (//) dirname filename =
+  let l = String.length dirname in
+  if l = 0 || dirname.[l-1] = '/'
+  then dirname ^ filename
+  else dirname ^ "/" ^ filename
+
+(* Excluding directories; We avoid directories starting with . as well
+   as CVS and _darcs and any subdirs given via -exclude-dir *)
+
+let skipped_dirnames = ref ["CVS"; "_darcs"]
+
+let exclude_directory f = skipped_dirnames := f :: !skipped_dirnames
+
+let ok_dirname f =
+  not (f = "") && f.[0] != '.' &&
+  not (List.mem f !skipped_dirnames) (*&&
+  (match Unicode.ident_refutation f with None -> true | _ -> false)*)
+
+(* Check directory can be opened *)
+
+let exists_dir dir =
+  try let _ = closedir (opendir dir) in true with Unix_error _ -> false
+
+let check_unix_dir warn dir =
+  if (Sys.os_type = "Win32" || Sys.os_type = "Cygwin") &&
+    (String.length dir > 2 && dir.[1] = ':' ||
+     String.contains dir '\\' ||
+     String.contains dir ';')
+  then warn ("assuming " ^ dir ^
+             " to be a Unix path even if looking like a Win32 path.")
+
+let apply_subdir f path name =
+  (* we avoid all files and subdirs starting by '.' (e.g. .svn) *)
+  (* as well as skipped files like CVS, ... *)
+  if name.[0] <> '.' && ok_dirname name then
+    let path = if path = "." then name else path//name in
+    match try (stat path).st_kind with Unix_error _ -> S_BLK with
+    | S_DIR -> f (FileDir (path,name))
+    | S_REG -> f (FileRegular name)
+    | _ -> ()
+
+let process_directory f path =
+  let dirh = opendir path in
+  try while true do apply_subdir f path (readdir dirh) done
+  with End_of_file -> closedir dirh
+
+let process_subdirectories f path =
+  let f = function FileDir (path,base) -> f path base | FileRegular _ -> () in
+  process_directory f path
+