--- a/tool/MasterDevice.cpp	Wed Oct 01 08:44:44 2008 +0000
+++ b/tool/MasterDevice.cpp	Wed Oct 01 08:45:16 2008 +0000
@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <sys/ioctl.h>
 #include <string.h>
+#include <unistd.h>
 
 #include <sstream>
 #include <iomanip>