Index: emacspeak-ss/ping-apollo.c
===================================================================
--- emacspeak-ss.orig/ping-apollo.c	1998-12-07 01:57:06.000000000 +0100
+++ emacspeak-ss/ping-apollo.c	2012-11-30 15:46:51.394257750 +0100
@@ -9,6 +9,8 @@
 #include <sys/time.h>
 #include <unistd.h>
 #include <linux/serial.h>
+#include <stdlib.h>
+#include <string.h>
 
 #define DEFAULT_DEVICE "/dev/ttyS0"
 #define MAXCHARS 128