@@ -, +, @@ 
---
 Source/WebCore/dom/SlotAssignment.h | 1 +
 1 file changed, 1 insertion(+)
--- a/Source/WebCore/dom/SlotAssignment.h	
+++ a/Source/WebCore/dom/SlotAssignment.h	
@@ -28,6 +28,7 @@ 
 
 #if ENABLE(SHADOW_DOM) || ENABLE(DETAILS_ELEMENT)
 
+#include <functional>
 #include <wtf/HashMap.h>
 #include <wtf/HashSet.h>
 #include <wtf/Vector.h>