Index: intern/cycles/util/util_path.cpp
===================================================================
--- intern/cycles/util/util_path.cpp	(revision 49328)
+++ intern/cycles/util/util_path.cpp	(working copy)
@@ -26,6 +26,8 @@
 
 #include <stdio.h>
 
+#include <boost/version.hpp>
+
 #if (BOOST_VERSION < 104400)
 #  define BOOST_FILESYSTEM_VERSION 2
 #endif
Index: intern/cycles/util/util_cache.cpp
===================================================================
--- intern/cycles/util/util_cache.cpp	(revision 49328)
+++ intern/cycles/util/util_cache.cpp	(working copy)
@@ -26,6 +26,8 @@
 #include "util_path.h"
 #include "util_types.h"
 
+#include <boost/version.hpp>
+
 #if (BOOST_VERSION < 104400)
 #  define BOOST_FILESYSTEM_VERSION 2
 #endif