From 662535bf16b14d4a2351b635006491b4881e3b50 Mon Sep 17 00:00:00 2001
From: Frank Dellaert <dellaert@gmail.com>
Date: Sun, 5 Feb 2023 23:14:15 -0800
Subject: [PATCH] add missing header

---
 gtsam/inference/tests/testSymbol.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gtsam/inference/tests/testSymbol.cpp b/gtsam/inference/tests/testSymbol.cpp
index bedd69044..af49a1e2e 100644
--- a/gtsam/inference/tests/testSymbol.cpp
+++ b/gtsam/inference/tests/testSymbol.cpp
@@ -18,6 +18,8 @@
 
 #include <CppUnitLite/TestHarness.h>
 
+#include <sstream>
+
 using namespace std;
 using namespace gtsam;