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diff --git a/sysdeps/nacl/kernel-features.h b/sysdeps/nacl/kernel-features.h
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+/* Set flags signalling availability of certain operating system features.
+ Copyright (C) 2015 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* This file can define __ASSUME_* macros checked by certain source files.
+ Almost none of these are used outside of sysdeps/unix/sysv/linux code.
+ But those referring to POSIX-level features like O_* flags can be. */
+
+#define __ASSUME_O_CLOEXEC 1
+
+/*
+#define __ASSUME_DUP3 1
+#define __ASSUME_ACCEPT4 1
+*/