pcapfilter.c

#ifdef __gnu_linux__
#define SPORT source
#define DPORT dest
#else
#define SPORT th_sport
#define DPORT th_dport
#endif

// ...

	switch(ip_next)
	{
		case IPPROTO_TCP:
			tcp_hdr = (struct tcphdr *)pkt_ptr;	
			sport = tcp_hdr->SPORT;	
			dport = tcp_hdr->DPORT;
		break;
		case IPPROTO_UDP:
			udp_hdr = (struct udphdr *)pkt_ptr;	
			sport = udp_hdr->SPORT;
			dport = udp_hdr->DPORT;
		break;