From 32ecaf7e89205371571f66f2b8beb95fc2e9a07c Mon Sep 17 00:00:00 2001
From: Frank <frank@skyd.io>
Date: Tue, 12 May 2015 12:42:06 -0700
Subject: [PATCH] Forgotten header

---
 gtsam/nonlinear/Expression.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gtsam/nonlinear/Expression.h b/gtsam/nonlinear/Expression.h
index 3985d8a58..afbc5e93a 100644
--- a/gtsam/nonlinear/Expression.h
+++ b/gtsam/nonlinear/Expression.h
@@ -24,6 +24,7 @@
 #include <gtsam/base/OptionalJacobian.h>
 
 #include <boost/bind.hpp>
+#include <boost/make_shared.hpp>
 #include <map>
 
 // Forward declare tests