From a90115b2cab90297bd0604a84019e814375b1249 Mon Sep 17 00:00:00 2001
From: Jack Zhang <18280101+jackz314@users.noreply.github.com>
Date: Tue, 24 Apr 2018 23:16:55 -0700
Subject: [PATCH] Update finger_metrics.h

fix unscoped sqrtf() function.
---
 include/gestures/include/finger_metrics.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/gestures/include/finger_metrics.h b/include/gestures/include/finger_metrics.h
index 5440e19..94d61f5 100644
--- a/include/gestures/include/finger_metrics.h
+++ b/include/gestures/include/finger_metrics.h
@@ -5,6 +5,8 @@
 #ifndef GESTURES_FINGER_METRICS_H_
 #define GESTURES_FINGER_METRICS_H_
 
+#include <cmath>
+
 #include "gestures/include/gestures.h"
 #include "gestures/include/prop_registry.h"
 #include "gestures/include/vector.h"