--- rdate.orig/ntp.c	2007-08-17 17:03:24.000000000 +0200
+++ rdate/ntp.c	2013-12-30 23:07:06.000000000 +0100
@@ -37,6 +37,7 @@
 #include <sys/time.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <sys/types.h>
 
 #include <ctype.h>
 #include <err.h>
@@ -100,9 +101,9 @@ struct ntp_data {
 	double		transmit;
 	double		current;
 	double		originate;
-	u_int64_t	xmitck;
-	u_int64_t	recvck;
-	u_int32_t	refid;
+	uint64_t	xmitck;
+	uint64_t	recvck;
+	uint32_t	refid;
 	u_char		status;
 	u_char		version;
 	u_char		mode;
@@ -268,7 +269,7 @@ write_packet(int fd, struct ntp_data *da
 
 	packet[0] = ((nver ? nver : NTP_VERSION) << 3) | (NTP_MODE_CLIENT);
 
-	data->xmitck = (u_int64_t)arc4random() << 32 | arc4random();
+	data->xmitck = (uint64_t)arc4random() << 32 | arc4random();
 
 	/*
 	 * Send out a random 64-bit number as our transmit time.  The NTP
@@ -286,7 +287,7 @@ write_packet(int fd, struct ntp_data *da
 	 * the transmit field intelligible.
 	 */
 
-	memcpy(packet + NTP_TRANSMIT, &data->xmitck, sizeof (u_int64_t));
+	memcpy(packet + NTP_TRANSMIT, &data->xmitck, sizeof (uint64_t));
 
 	data->originate = current_time(JAN_1970);
 
@@ -437,7 +438,7 @@ unpack_ntp(struct ntp_data *data, u_char
 	data->transmit = d / NTP_SCALE;
 
 	/* See write_packet for why this isn't an endian problem. */
-	memcpy(&data->recvck, packet + NTP_ORIGINATE, sizeof (u_int64_t));
+	memcpy(&data->recvck, packet + NTP_ORIGINATE, sizeof (uint64_t));
 }
 
 /*