diff -ruN src/io.cpp.orig src/io.cpp
--- src/io.cpp.orig     2012-05-19 20:48:05.930777509 +0200
+++ src/io.cpp  2012-05-19 20:49:04.303822711 +0200
@@ -20,6 +20,8 @@
 
 /** @file io.cpp Implementation of reading/writing to files */
 
+#include <unistd.h>
+
 #include "stdafx.h"
 #include "io.hpp"
 
diff -ruN src/catcodec.cpp.orig src/catcodec.cpp
--- src/catcodec.cpp.orig       2012-05-19 20:47:55.847255343 +0200
+++ src/catcodec.cpp    2012-05-19 20:48:38.937144091 +0200
@@ -22,6 +22,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "stdafx.h"
 #include "io.hpp"