--- old/src/hotspot/share/libadt/vectset.cpp	2018-03-15 12:08:09.920527224 -0400
+++ new/src/hotspot/share/libadt/vectset.cpp	2018-03-15 12:08:09.301470407 -0400
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "libadt/vectset.hpp"
 #include "memory/allocation.inline.hpp"
+#include "memory/arena.hpp"
 
 // Vector Sets - An Abstract Data Type