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diff --git a/sysdeps/unix/sysv/linux/bits/posix_opt.h b/sysdeps/unix/sysv/linux/bits/posix_opt.h
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+/* Define POSIX options for Linux.
+ Copyright (C) 1996 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/*
+ * Never include this file directly; use <unistd.h> instead.
+ */
+
+#ifndef _BITS_POSIX_OPT_H
+#define _BITS_POSIX_OPT_H 1
+
+/* Job control is supported. */
+#define _POSIX_JOB_CONTROL 1
+
+/* Processes have a saved set-user-ID and a saved set-group-ID. */
+#define _POSIX_SAVED_IDS 1
+
+/* Priority scheduling is supported. */
+#define _POSIX_PRIORITY_SCHEDULING 1
+
+/* Synchronizing file data is supported. */
+#define _POSIX_SYNCHRONIZED_IO 1
+
+/* The fsync function is present. */
+#define _POSIX_FSYNC 1
+
+/* Mapping of files to memory is supported. */
+#define _POSIX_MAPPED_FILES 1
+
+/* Locking of all memory is supported. */
+#define _POSIX_MEMLOCK 1
+
+/* Locking of ranges of memory is supported. */
+#define _POSIX_MEMLOCK_RANGE 1
+
+/* Setting of memory protections is supported. */
+#define _POSIX_MEMORY_PROTECTION 1
+
+/* Implementation supports `poll' function. */
+#define _POSIX_POLL 1
+
+/* Implementation supports `select' and `pselect' functions. */
+#define _POSIX_SELECT 1
+
+/* Only root can change owner of file. */
+#define _POSIX_CHOWN_RESTRICTED 1
+
+/* `c_cc' member of 'struct termios' structure can be disabled by
+ using the value _POSIX_VDISABLE. */
+#define _POSIX_VDISABLE '\0'
+
+/* Filenames are not silently truncated. */
+#define _POSIX_NO_TRUNC 1
+
+/* XPG4.2 shared memory is supported. */
+#define _XOPEN_SHM 1
+
+#endif /* bits/posix_opt.h */