From 6035d665683ac66c97f61c9bfb6de26a11f910c3 Mon Sep 17 00:00:00 2001
From: Nil Geisweiller <ngeiswei@gmail.com>
Date: Mon, 12 Dec 2016 05:16:02 +0200
Subject: [PATCH] Hopefully fix issue #44

---
 .../boost_ext/accumulators/statistics/geometric_mean_mirror.h   | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/opencog/util/boost_ext/accumulators/statistics/geometric_mean_mirror.h b/opencog/util/boost_ext/accumulators/statistics/geometric_mean_mirror.h
index 70977b04cc..d6a5ec0d47 100644
--- a/opencog/util/boost_ext/accumulators/statistics/geometric_mean_mirror.h
+++ b/opencog/util/boost_ext/accumulators/statistics/geometric_mean_mirror.h
@@ -23,6 +23,8 @@
 #ifndef OPENCOG_UTIL_GEOMETRIC_MEAN_MIRROR
 #define OPENCOG_UTIL_GEOMETRIC_MEAN_MIRROR
 
+#include  <cmath>
+
 #include <boost/mpl/placeholders.hpp>
 #include <boost/accumulators/framework/accumulator_base.hpp>
 #include <boost/accumulators/framework/extractor.hpp>