From b38d3b360e6d138e51e6d2bf5fd8a3dcd9aa111c Mon Sep 17 00:00:00 2001
From: Jitse Niesen <jitse@maths.leeds.ac.uk>
Date: Tue, 6 Sep 2011 06:52:04 +0100
Subject: [PATCH] Define log2() on FreeBSD (fixes bug #343).

---
 unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h b/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
index 7fd36eca6..c6e77dd37 100644
--- a/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
+++ b/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
@@ -28,7 +28,7 @@
 
 #include "StemFunction.h"
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || defined(__FreeBSD__)
   template <typename Scalar> Scalar log2(Scalar v) { using std::log; return log(v)/log(Scalar(2)); }
 #endif