diff -ur libindi-0.9/drivers/focuser/robofocus.cpp libindi-0.9.new/drivers/focuser/robofocus.cpp
--- libindi-0.9/drivers/focuser/robofocus.cpp	2012-01-13 19:40:06.000000000 +0100
+++ libindi-0.9.new/drivers/focuser/robofocus.cpp	2012-01-24 23:34:02.814667216 +0100
@@ -25,6 +25,7 @@
 #include <termios.h>
 #include <string.h>
 #include <sys/time.h>
+#include <unistd.h>
 
 #define RF_MAX_CMD   9
 #define RF_TIMEOUT   15