--- msn/util.cpp.orig	2013-12-04 23:47:40.000000000 +0900
+++ msn/util.cpp	2013-12-04 23:47:56.000000000 +0900
@@ -33,6 +33,8 @@
 #include "md5.h"
 #include "libsiren/siren7.h"
 
+#include <unistd.h>
+
 #ifdef _WIN32
 #define random rand
 #endif