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/usr/aarch64-linux-gnu/include/linux/if_phonet.h is in linux-libc-dev-arm64-cross 4.9.25-1cross1.

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/*
 * File: if_phonet.h
 *
 * Phonet interface kernel definitions
 *
 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
 */
#ifndef LINUX_IF_PHONET_H
#define LINUX_IF_PHONET_H

#define PHONET_MIN_MTU		6	/* pn_length = 0 */
#define PHONET_MAX_MTU		65541	/* pn_length = 0xffff */
#define PHONET_DEV_MTU		PHONET_MAX_MTU


#endif /* LINUX_IF_PHONET_H */