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-rw-r--r--unsupported/Eigen/SpecialFunctions2
1 files changed, 2 insertions, 0 deletions
diff --git a/unsupported/Eigen/SpecialFunctions b/unsupported/Eigen/SpecialFunctions
index 7c7493c56..a2ad4925e 100644
--- a/unsupported/Eigen/SpecialFunctions
+++ b/unsupported/Eigen/SpecialFunctions
@@ -10,6 +10,8 @@
#ifndef EIGEN_SPECIALFUNCTIONS_MODULE
#define EIGEN_SPECIALFUNCTIONS_MODULE
+#include <math.h>
+
#include "../../Eigen/Core"
#include "../../Eigen/src/Core/util/DisableStupidWarnings.h"