Add more compile checks and resolve warnings

Jan Breuer

2015-04-22 c40ce04acce103186b4a7eceea6d84ea22499c7d

 examples/test-tcp/main.c

@@ -44,6 +44,7 @@
#include <sys/ioctl.h>
#include <errno.h>
#include <arpa/inet.h>
#include <unistd.h>

#include "scpi/scpi.h"
#include "../common/scpi-def.h"