[repacker] add make_extension_context_t.
diff --git a/src/graph/graph.hh b/src/graph/graph.hh
index c9aaec1..0d09f33 100644
--- a/src/graph/graph.hh
+++ b/src/graph/graph.hh
@@ -24,6 +24,10 @@
  * Google Author(s): Garret Rieger
  */
 
+#include "hb-set.hh"
+#include "hb-priority-queue.hh"
+#include "hb-serialize.hh"
+
 #ifndef GRAPH_GRAPH_HH
 #define GRAPH_GRAPH_HH