--- Source/main.cpp.orig	2010-11-27 23:40:52.000000000 +0900
+++ Source/main.cpp	2013-10-28 05:55:07.000000000 +0900
@@ -24,6 +24,7 @@
 #include <stdlib.h>
 #include <sstream>
 #include <stdexcept>
+#include <unistd.h>
 
 using namespace std;
 using namespace blahtex;