From 856efa28aab9a140f37875a7ed5df96419280ad0 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 17 Jul 2019 19:37:08 -0400
Subject: [PATCH] fix issue #1568

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

diff --git a/src/utils.cpp b/src/utils.cpp
index bbda22f24c..34e6e6fae6 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -13,6 +13,7 @@
 
 #include <mpi.h>
 #include <cstring>
+#include <cstdlib>
 #include "utils.h"
 #include "lammps.h"
 #include "error.h"