The udphdr structure has uh_* fields when _FAVOR_BSD is
defined. Otherwise, the fields are just named source, dest, len and
check. See <netinet/udp.h>.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: dhcpdump-1.8/dhcpdump.c
===================================================================
--- dhcpdump-1.8.orig/dhcpdump.c	2011-05-17 20:20:46.506980003 +0200
+++ dhcpdump-1.8/dhcpdump.c	2011-05-17 20:20:59.338979999 +0200
@@ -163,10 +163,10 @@
 	strcpy(ip_origin, (u_char *)inet_ntoa(ip->ip_src));
 	strcpy(ip_destination, (u_char *)inet_ntoa(ip->ip_dst));
 
-	if (hmask && check_ch((u_char *)(sp + offset), ntohs(udp->uh_ulen)))
+	if (hmask && check_ch((u_char *)(sp + offset), ntohs(udp->len)))
 		return;
 
-	printdata((u_char *)(sp + offset), ntohs(udp->uh_ulen));
+	printdata((u_char *)(sp + offset), ntohs(udp->len));
 }
 
 // check for matching CHADDR (Peter Apian-Bennewitz <apian@ise.fhg.de>)