diff -ru ois-v1-3.orig/demos/FFConsoleDemo.cpp ois-v1-3/demos/FFConsoleDemo.cpp
--- ois-v1-3.orig/demos/FFConsoleDemo.cpp	2010-04-01 05:38:04.000000000 +0200
+++ ois-v1-3/demos/FFConsoleDemo.cpp	2013-11-28 10:47:41.663835972 +0100
@@ -1,5 +1,6 @@
 #include "OIS.h"
 
+#include <unistd.h>
 #include <math.h>
 #include <cstdlib>
 #include <iostream>
diff -ru ois-v1-3.orig/demos/OISConsole.cpp ois-v1-3/demos/OISConsole.cpp
--- ois-v1-3.orig/demos/OISConsole.cpp	2010-08-16 00:51:34.000000000 +0200
+++ ois-v1-3/demos/OISConsole.cpp	2013-11-28 10:46:58.172275224 +0100
@@ -9,6 +9,7 @@
 //Advanced Usage
 #include "OISForceFeedback.h"
 
+#include <unistd.h>
 #include <iostream>
 #include <vector>
 #include <sstream>
diff -ru ois-v1-3.orig/src/linux/LinuxForceFeedback.cpp ois-v1-3/src/linux/LinuxForceFeedback.cpp
--- ois-v1-3.orig/src/linux/LinuxForceFeedback.cpp	2010-04-01 05:06:55.000000000 +0200
+++ ois-v1-3/src/linux/LinuxForceFeedback.cpp	2013-11-28 10:46:36.888490190 +0100
@@ -23,6 +23,7 @@
 #include "linux/LinuxForceFeedback.h"
 #include "OISException.h"
 
+#include <unistd.h>
 #include <cstdlib>
 #include <errno.h>
 #include <memory.h>
diff -ru ois-v1-3.orig/src/linux/LinuxJoyStickEvents.cpp ois-v1-3/src/linux/LinuxJoyStickEvents.cpp
--- ois-v1-3.orig/src/linux/LinuxJoyStickEvents.cpp	2013-11-28 10:45:51.365949979 +0100
+++ ois-v1-3/src/linux/LinuxJoyStickEvents.cpp	2013-11-28 10:46:07.617785829 +0100
@@ -35,6 +35,7 @@
 #include <linux/input.h>
 
 
+#include <unistd.h>
 #include <sstream>
 # include <iostream>
 using namespace std;