diff --git a/auth.c b/auth.c
index 544e1a9..e1551ff 100644
--- a/auth.c
+++ b/auth.c
@@ -42,24 +42,24 @@ extern char               *auth_uri;
 /* AKA */
 
 #define KLEN 16
-typedef u_char K[KLEN];
+typedef unsigned char K[KLEN];
 #define RANDLEN 16
-typedef u_char RAND[RANDLEN];
+typedef unsigned char RAND[RANDLEN];
 #define AUTNLEN 16
-typedef u_char AUTN[AUTNLEN];
+typedef unsigned char AUTN[AUTNLEN];
 
 #define AKLEN 6
-typedef u_char AK[AKLEN];
+typedef unsigned char AK[AKLEN];
 #define AMFLEN 2
-typedef u_char AMF[AMFLEN];
+typedef unsigned char AMF[AMFLEN];
 #define MACLEN 8
-typedef u_char MAC[MACLEN];
+typedef unsigned char MAC[MACLEN];
 #define CKLEN 16
-typedef u_char CK[CKLEN];
+typedef unsigned char CK[CKLEN];
 #define IKLEN 16
-typedef u_char IK[IKLEN];
+typedef unsigned char IK[IKLEN];
 #define SQNLEN 6
-typedef u_char SQN[SQNLEN];
+typedef unsigned char SQN[SQNLEN];
 #define AUTSLEN 14
 typedef char AUTS[AUTSLEN];
 #define AUTS64LEN 29
@@ -69,7 +69,7 @@ typedef unsigned char RES[RESLEN+1];
 #define RESHEXLEN 17
 typedef char RESHEX[RESHEXLEN];
 #define OPLEN 16
-typedef u_char OP[OPLEN];
+typedef unsigned char OP[OPLEN];
 
 AMF amfstar="\0\0";
 SQN sqn_he={0x00,0x00,0x00,0x00,0x00,0x00};
diff --git a/prepare_pcap.c b/prepare_pcap.c
index 07ccb26..d6dd102 100644
--- a/prepare_pcap.c
+++ b/prepare_pcap.c
@@ -15,6 +15,7 @@
  *
  *  Author : Guillaume TEISSIER from FTR&D 02/02/2006
  */
+#define _GNU_SOURCE
 #include <pcap.h>
 #include <stdlib.h>
 #include <netinet/in.h>
@@ -84,11 +85,11 @@ char errbuf[PCAP_ERRBUF_SIZE];
 int prepare_pkts(char *file, pcap_pkts *pkts) {
   pcap_t *pcap;
   struct pcap_pkthdr *pkthdr = NULL;
-  u_char *pktdata = NULL;
+  unsigned char *pktdata = NULL;
   int n_pkts = 0;
-  u_long max_length = 0;
+  unsigned long max_length = 0;
   u_int16_t base = 0xffff;
-  u_long pktlen;
+  unsigned long pktlen;
   pcap_pkt *pkt_index;
   ether_hdr *ethhdr;
   struct iphdr *iphdr;
@@ -102,7 +103,7 @@ int prepare_pkts(char *file, pcap_pkts *pkts) {
     ERROR("Can't open PCAP file '%s'", file);
 
 #if HAVE_PCAP_NEXT_EX
-  while (pcap_next_ex (pcap, &pkthdr, (const u_char **) &pktdata) == 1)
+  while (pcap_next_ex (pcap, &pkthdr, (const unsigned char **) &pktdata) == 1)
   {
 #else
 #ifdef __HPUX
@@ -112,7 +113,7 @@ int prepare_pkts(char *file, pcap_pkts *pkts) {
 #endif
   if (!pkthdr)
     ERROR("Can't allocate memory for pcap pkthdr");
-  while ((pktdata = (u_char *) pcap_next (pcap, pkthdr)) != NULL)
+  while ((pktdata = (unsigned char *) pcap_next (pcap, pkthdr)) != NULL)
   {
 #endif
     ethhdr = (ether_hdr *)pktdata;
@@ -124,7 +125,7 @@ int prepare_pkts(char *file, pcap_pkts *pkts) {
     iphdr = (struct iphdr *)((char *)ethhdr + sizeof(*ethhdr));
     if (iphdr && iphdr->version == 6) {
       //ipv6
-      pktlen = (u_long) pkthdr->len - sizeof(*ethhdr) - sizeof(*ip6hdr);
+      pktlen = (unsigned long) pkthdr->len - sizeof(*ethhdr) - sizeof(*ip6hdr);
       ip6hdr = (ipv6_hdr *)(void *) iphdr;
       if (ip6hdr->nxt_header != IPPROTO_UDP) {
         fprintf(stderr, "prepare_pcap.c: Ignoring non UDP packet!\n");
@@ -139,13 +140,13 @@ int prepare_pkts(char *file, pcap_pkts *pkts) {
       }
 #if defined(__DARWIN) || defined(__CYGWIN) || defined(__FreeBSD__)
       udphdr = (struct udphdr *)((char *)iphdr + (iphdr->ihl << 2) + 4);
-      pktlen = (u_long)(ntohs(udphdr->uh_ulen));
+      pktlen = (unsigned long)(ntohs(udphdr->uh_ulen));
 #elif defined ( __HPUX)
       udphdr = (struct udphdr *)((char *)iphdr + (iphdr->ihl << 2));
-      pktlen = (u_long) pkthdr->len - sizeof(*ethhdr) - sizeof(*iphdr);
+      pktlen = (unsigned long) pkthdr->len - sizeof(*ethhdr) - sizeof(*iphdr);
 #else
       udphdr = (struct udphdr *)((char *)iphdr + (iphdr->ihl << 2));
-      pktlen = (u_long)(ntohs(udphdr->len));
+      pktlen = (unsigned long)(ntohs(udphdr->len));
 #endif
     }
     if (pktlen > PCAP_MAXPACKET) {
diff --git a/prepare_pcap.h b/prepare_pcap.h
index ae90556..e89ab52 100644
--- a/prepare_pcap.h
+++ b/prepare_pcap.h
@@ -52,8 +52,8 @@ struct iphdr
 
 typedef struct
 {
-  u_char *data;
-  u_long pktlen;
+  unsigned char *data;
+  unsigned long pktlen;
   struct timeval ts;
   int partial_check;
 } pcap_pkt;
@@ -63,7 +63,7 @@ typedef struct
 {
   char *file;
   u_int16_t base;
-  u_long max_length;
+  unsigned long max_length;
   pcap_pkt *max;
   pcap_pkt *pkts;
 } pcap_pkts;