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diff --git a/lib/dup-safer.c b/lib/dup-safer.c
deleted file mode 100644
index 7d9b2be..0000000
--- a/lib/dup-safer.c
+++ /dev/null
@@ -1,42 +0,0 @@
-/* Invoke dup, but avoid some glitches.
-
-   Copyright (C) 2001, 2004, 2005, 2006, 2009 Free Software
-   Foundation, Inc.
-
-   This program 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 3 of the License, or
-   (at your option) any later version.
-
-   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* Written by Paul Eggert.  */
-
-#include <config.h>
-
-#include "unistd-safer.h"
-
-#include <fcntl.h>
-
-#include <unistd.h>
-
-/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
-   STDERR_FILENO.  */
-
-int
-dup_safer (int fd)
-{
-#if defined F_DUPFD && !defined FCHDIR_REPLACEMENT
-  return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
-#else
-  /* fd_safer calls us back, but eventually the recursion unwinds and
-     does the right thing.  */
-  return fd_safer (dup (fd));
-#endif
-}