From 33baf69d3e1028659a535b51501347b355ae10d9 Mon Sep 17 00:00:00 2001
From: Stephen Sinclair <radarsat1@gmail.com>
Date: Tue, 31 Mar 2020 13:44:38 +0200
Subject: [PATCH] Envelope.cpp: include cmath for fabs

---
 src/Envelope.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Envelope.cpp b/src/Envelope.cpp
index 0ba1a76..39de929 100644
--- a/src/Envelope.cpp
+++ b/src/Envelope.cpp
@@ -13,6 +13,7 @@
 /***************************************************/
 
 #include "Envelope.h"
+#include <cmath>
 
 namespace stk {