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/usr/lib/klibc/include/netinet/ip.h is in libklibc-dev 2.0.3-0ubuntu1.

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/*
 * netinet/ip.h
 */

#ifndef _NETINET_IP_H
#define _NETINET_IP_H

#include <endian.h>
#include <linux/ip.h>

#define IP_DF		0x4000	/* Flag: "Don't Fragment" */

#endif				/* _NETINET_IP_H */