From 3ef0eabff614bcb06a580572dc915026ff20c7a0 Mon Sep 17 00:00:00 2001
From: Paul Furgale <paul.furgale@gmail.com>
Date: Sat, 22 Nov 2014 14:55:32 +0100
Subject: [PATCH] Merged in changes from develop

---
 gtsam_unstable/nonlinear/ExpressionFactor.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gtsam_unstable/nonlinear/ExpressionFactor.h b/gtsam_unstable/nonlinear/ExpressionFactor.h
index f609071cb..22a2aefeb 100644
--- a/gtsam_unstable/nonlinear/ExpressionFactor.h
+++ b/gtsam_unstable/nonlinear/ExpressionFactor.h
@@ -17,6 +17,8 @@
  * @brief Expressions for Block Automatic Differentiation
  */
 
+#pragma once
+
 #include <gtsam_unstable/nonlinear/Expression.h>
 #include <gtsam/nonlinear/NonlinearFactor.h>
 #include <gtsam/base/Testable.h>