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-rw-r--r--unsupported/Eigen/KroneckerProduct2
1 files changed, 2 insertions, 0 deletions
diff --git a/unsupported/Eigen/KroneckerProduct b/unsupported/Eigen/KroneckerProduct
index c932c06a6..5f5afb8cf 100644
--- a/unsupported/Eigen/KroneckerProduct
+++ b/unsupported/Eigen/KroneckerProduct
@@ -13,6 +13,8 @@
#include "../../Eigen/src/Core/util/DisableStupidWarnings.h"
+#include "../../Eigen/src/SparseCore/SparseUtil.h"
+
namespace Eigen {
/**