diff -ur ppp-2.4.7.orig/pppd/plugins/dhcp/clientpacket.c ppp-2.4.7/pppd/plugins/dhcp/clientpacket.c
--- ppp-2.4.7.orig/pppd/plugins/dhcp/clientpacket.c	2002-08-31 12:19:20.000000000 +0000
+++ ppp-2.4.7/pppd/plugins/dhcp/clientpacket.c	2015-05-20 13:24:41.299978928 +0000
@@ -205,9 +205,9 @@
 	
 	/* Make sure its the right packet for us, and that it passes sanity checks */
 	if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION ||
-	    packet.ip.ihl != sizeof(packet.ip) >> 2 || packet.udp.dest != htons(CLIENT_PORT) ||
+	    packet.ip.ihl != sizeof(packet.ip) >> 2 || packet.udp.uh_dport != htons(CLIENT_PORT) ||
 	    bytes > (int) sizeof(struct udp_dhcp_packet) ||
-	    ntohs(packet.udp.len) != (short) (bytes - sizeof(packet.ip))) {
+	    ntohs(packet.udp.uh_ulen) != (short) (bytes - sizeof(packet.ip))) {
 	    	DEBUG(LOG_INFO, "unrelated/bogus packet");
 	    	return -1;
 	}
@@ -223,14 +223,14 @@
 	/* verify the UDP checksum by replacing the header with a psuedo header */
 	source = packet.ip.saddr;
 	dest = packet.ip.daddr;
-	check = packet.udp.check;
-	packet.udp.check = 0;
+	check = packet.udp.uh_sum;
+	packet.udp.uh_sum = 0;
 	memset(&packet.ip, 0, sizeof(packet.ip));
 
 	packet.ip.protocol = IPPROTO_UDP;
 	packet.ip.saddr = source;
 	packet.ip.daddr = dest;
-	packet.ip.tot_len = packet.udp.len; /* cheat on the psuedo-header */
+	packet.ip.tot_len = packet.udp.uh_ulen; /* cheat on the psuedo-header */
 	if (check && check != checksum(&packet, bytes)) {
 		DEBUG(LOG_ERR, "packet with bad UDP checksum received, ignoring");
 		return -1;
diff -ur ppp-2.4.7.orig/pppd/plugins/dhcp/dhcpd.h ppp-2.4.7/pppd/plugins/dhcp/dhcpd.h
--- ppp-2.4.7.orig/pppd/plugins/dhcp/dhcpd.h	2002-08-31 11:52:31.000000000 +0000
+++ ppp-2.4.7/pppd/plugins/dhcp/dhcpd.h	2015-05-20 13:24:10.999978974 +0000
@@ -4,6 +4,7 @@
 
 #include <netinet/ip.h>
 #include <netinet/udp.h>
+#include <sys/types.h>
 
 #include "leases.h"