From owner-freebsd-hackers@FreeBSD.ORG  Mon Jul  7 07:30:45 2003
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Date: Mon, 7 Jul 2003 16:30:26 +0200
From: Viktor Vasilev <viktor@rbg.informatik.tu-darmstadt.de>
To: Alin-Adrian Anton <aanton@reversedhell.net>
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Subject: Re: raw socket programming
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Hi,

On Sun, Jul 06, 2003 at 05:14:38AM +0300, Alin-Adrian Anton wrote:
> Well, I don't wanna be idiot, perhaps I am too tired, but n_long appears 
> in ip.h defined as :
> 
> beast# grep ipt_time /usr/include/netinet/ip.h
>        union ipt_timestamp {
>                n_long  ipt_time[1];
>                        n_long ipt_time;
>        } ipt_timestamp;
> beast# grep ipt_time /usr/include/netinet/*
> /usr/include/netinet/ip.h:      union ipt_timestamp {
> /usr/include/netinet/ip.h:              n_long  ipt_time[1];
> /usr/include/netinet/ip.h:                      n_long ipt_time;
> /usr/include/netinet/ip.h:      } ipt_timestamp;
> beast#

Actually it's defined in:
/usr/include/netinet/in_systm.h:typedef u_int32_t n_long;          /* long as received from the net */

What the problem might be, is that in_systm.h isn't included anywhere:
cd /usr/include; grep in_systm.h `find . -type f`
./netinet/in_systm.h: * @(#)in_systm.h  8.1 (Berkeley) 6/10/93
./netinet/in_systm.h: * $FreeBSD: src/sys/netinet/in_systm.h,v 1.10 2002/03/19 21:25:46 alfred Exp $

Hope this helps.

Regards,
Viktor

-- 
He who asks is a fool for five minutes, but he 
who does not ask reamins a fool forever.
     Old Chinese saying