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-rw-r--r--Eigen/src/Core/MathFunctions.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Eigen/src/Core/MathFunctions.h b/Eigen/src/Core/MathFunctions.h
index 4ce616746..fab2d9a72 100644
--- a/Eigen/src/Core/MathFunctions.h
+++ b/Eigen/src/Core/MathFunctions.h
@@ -338,6 +338,7 @@ struct hypot_impl
using std::max;
using std::min;
using std::abs;
+ using std::sqrt;
RealScalar _x = abs(x);
RealScalar _y = abs(y);
RealScalar p = (max)(_x, _y);