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-rw-r--r--test/mpl2only.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/mpl2only.cpp b/test/mpl2only.cpp
index 7d04d6bba..296350d08 100644
--- a/test/mpl2only.cpp
+++ b/test/mpl2only.cpp
@@ -7,7 +7,9 @@
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#ifndef EIGEN_MPL2_ONLY
#define EIGEN_MPL2_ONLY
+#endif
#include <Eigen/Dense>
#include <Eigen/SparseCore>
#include <Eigen/SparseLU>