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-rw-r--r--Eigen/Core1
1 files changed, 1 insertions, 0 deletions
diff --git a/Eigen/Core b/Eigen/Core
index 0f7fa630d..ac7e39418 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -260,6 +260,7 @@
#include <cmath>
#include <cassert>
#include <functional>
+#include <sstream>
#include <iosfwd>
#include <cstring>
#include <string>