--- src/io.cpp.orig	
+++ src/io.cpp.orig	
@@ -20,6 +20,8 @@ 
 
 /** @file io.cpp Implementation of reading/writing to files */
 
+#include <unistd.h>
+
 #include "stdafx.h"
 #include "io.hpp"
 
--- src/catcodec.cpp.orig	
+++ src/catcodec.cpp.orig	
@@ -22,6 +22,7 @@ 
 
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "stdafx.h"
 #include "io.hpp"