From 1ddbd24a4e271e98ce60e8aea1a63e813150a49a Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Mon, 26 Nov 2018 15:45:23 -0500
Subject: [PATCH] add missing include file

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

diff --git a/src/write_coeff.cpp b/src/write_coeff.cpp
index 72b4835e55..83da6e4319 100644
--- a/src/write_coeff.cpp
+++ b/src/write_coeff.cpp
@@ -12,6 +12,7 @@
 ------------------------------------------------------------------------- */
 
 #include <cstring>
+#include <cstdlib>
 #include <unistd.h>
 #include "write_coeff.h"
 #include "pair.h"