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/usr/include/x86_64-linux-gnu/sys/kd.h is in libc6-dev 2.27-3ubuntu1.

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/* Copyright (C) 1996-2018 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/>.  */

#ifndef _SYS_KD_H
#define _SYS_KD_H	1

/* Make sure the <linux/types.h> header is not loaded.  */
#ifndef _LINUX_TYPES_H
# define _LINUX_TYPES_H		1
# define __undef_LINUX_TYPES_H
#endif

#include <linux/kd.h>

#ifdef __undef_LINUX_TYPES_H
# undef _LINUX_TYPES_H
# undef __undef_LINUX_TYPES_H
#endif

#endif	/* sys/kd.h */