diff -ur OpenCV-2.3.1.orig/modules/highgui/src/grfmt_tiff.cpp OpenCV-2.3.1/modules/highgui/src/grfmt_tiff.cpp
--- OpenCV-2.3.1.orig/modules/highgui/src/grfmt_tiff.cpp   2012-04-29 13:13:07.922892187 +0200
+++ OpenCV-2.3.1/modules/highgui/src/grfmt_tiff.cpp        2012-04-29 13:13:24.986679361 +0200
@@ -47,6 +47,7 @@
 
 #include "precomp.hpp"
 #include "grfmt_tiff.hpp"
+#include "unistd.h"
 
 namespace cv
 {
diff -ur OpenCV-2.3.1.orig/modules/highgui/src/window_QT.h OpenCV-2.3.1/modules/highgui/src/window_QT.h
--- OpenCV-2.3.1.orig/modules/highgui/src/window_QT.h	2012-04-29 14:02:40.372751730 +0200
+++ OpenCV-2.3.1/modules/highgui/src/window_QT.h	2012-04-29 14:03:02.012465635 +0200
@@ -42,6 +42,7 @@
 
 
 #include "precomp.hpp"
+#include "unistd.h"

 #if defined( HAVE_QT_OPENGL )
 #include <QtOpenGL>