--- src/plugins/png.cpp	2013-10-14 21:28:34.109215677 +0900
+++ src/plugins/png.cpp.new	2013-10-14 21:33:43.261057151 +0900
@@ -20,7 +20,7 @@
 
 #include <png.h>
 #include <stdexcept>
-
+#include <string.h>
 #include "util/log.hpp"
 
 struct PNGReadMemory