diff -Naur a/intern/cycles/util/util_cache.cpp b/intern/cycles/util/util_cache.cpp
--- a/intern/cycles/util/util_cache.cpp	2012-05-10 11:44:09.000000000 -0300
+++ b/intern/cycles/util/util_cache.cpp	2012-07-15 14:19:34.893238929 -0300
@@ -26,8 +26,6 @@
 #include "util_path.h"
 #include "util_types.h"
 
-#define BOOST_FILESYSTEM_VERSION 2
-
 #include <boost/filesystem.hpp> 
 #include <boost/algorithm/string.hpp>
 
@@ -117,7 +115,7 @@
 		boost::filesystem::directory_iterator it(dir), it_end;
 
 		for(; it != it_end; it++) {
-			string filename = it->path().filename();
+			string filename = it->path().filename().string();
 
 			if(boost::starts_with(filename, name))
 				if(except.find(filename) == except.end())
diff -Naur blender-2.63a/intern/cycles/util/util_path.cpp blender-2.63a-new/intern/cycles/util/util_path.cpp
--- a/intern/cycles/util/util_path.cpp	2012-05-10 11:44:09.000000000 -0300
+++ b/intern/cycles/util/util_path.cpp	2012-07-15 14:19:14.126293394 -0300
@@ -26,8 +26,6 @@
 
 #include <stdio.h>
 
-#define BOOST_FILESYSTEM_VERSION 2
-
 #include <boost/filesystem.hpp> 
 #include <boost/algorithm/string.hpp>
 
@@ -60,7 +58,7 @@
 
 string path_filename(const string& path)
 {
-	return boost::filesystem::path(path).filename();
+	return boost::filesystem::path(path).filename().string();
 }
 
 string path_dirname(const string& path)