From 6e81d013c650e0a61c6fb189a1757ec5cc7e0fa3 Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Sun, 2 Dec 2018 18:05:55 +0100
Subject: [PATCH] fix warning in help.c about system()

---
 src/help.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/help.c b/src/help.c
index b3f62bbc..7dfec322 100644
--- a/src/help.c
+++ b/src/help.c
@@ -45,6 +45,10 @@
     #include <sys/mount.h>
 #endif
 
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
+#include <stdlib.h>
+#endif
+
 #if defined(__macosx__)
 #import <CoreFoundation/CoreFoundation.h>
 /* defining __QD__ is a cheat to avoid :