--- dsniff-2.4b1.orig/sshow.c
+++ dsniff-2.4b1/sshow.c
@@ -85,6 +85,21 @@ usage(void)
 	exit(1);
 }
 
+static long clk_tck(void)
+{
+	static long t = 0;
+
+	if (t)
+		return t;
+
+#if defined(_SC_CLK_TCK) || !defined(CLK_TCK)
+	t = sysconf(_SC_CLK_TCK);
+#else
+	t = CLK_TCK;
+#endif
+	return t;
+}
+
 static clock_t
 add_history(struct session *session, int direction,
 	    u_int cipher_size, range *plain_range)
@@ -222,7 +237,7 @@ client_to_server(struct tcp_stream *ts, 
 	if (debug)
 		printf("- %s -> %s: DATA (%s bytes, %.2f seconds)\n",
 			s_saddr(ts), s_daddr(ts), s_range(plain_range),
-			(float)delay / CLK_TCK);
+			(float)delay / clk_tck());
 	if (debug > 1)
 		print_data(&ts->server, cipher_size);
 
@@ -270,7 +285,7 @@ server_to_client(struct tcp_stream *ts, 
 	if (debug)
 		printf("- %s <- %s: DATA (%s bytes, %.2f seconds)\n",
 		       s_saddr(ts), s_daddr(ts), s_range(plain_range),
-		       (float)delay / CLK_TCK);
+		       (float)delay / clk_tck());
 	if (debug > 1)
 		print_data(&ts->client, cipher_size);
 	
@@ -299,7 +314,7 @@ server_to_client(struct tcp_stream *ts, 
 	
 	if (session->state == 1 &&
 #ifdef USE_TIMING
-	    now - get_history(session, 2)->timestamp >= CLK_TCK &&
+	    now - get_history(session, 2)->timestamp >= clk_tck() &&
 #endif
 	    session->protocol == 1 &&
 	    (session->history.directions & 7) == 5 &&