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/usr/include/net/ppp_defs.h is in libc6-dev 2.23-0ubuntu10.

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#ifndef _NET_PPP_DEFS_H
#define _NET_PPP_DEFS_H 1

#define __need_time_t
#include <time.h>

#include <asm/types.h>
#include <linux/ppp_defs.h>

#endif /* net/ppp_defs.h */