From a2efef50795789d6a1736221f1b0eca4a8a7582d Mon Sep 17 00:00:00 2001
From: David Gauchard <gauchard@laas.fr>
Date: Mon, 21 Jan 2019 15:20:07 +0100
Subject: [PATCH] hardwareSerial: add missing include fix #5644

---
 cores/esp8266/HardwareSerial.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cores/esp8266/HardwareSerial.h b/cores/esp8266/HardwareSerial.h
index ce9a1c566c..9d50be55e5 100644
--- a/cores/esp8266/HardwareSerial.h
+++ b/cores/esp8266/HardwareSerial.h
@@ -28,6 +28,7 @@
 #define HardwareSerial_h
 
 #include <inttypes.h>
+#include <time.h>
 #include "Stream.h"
 #include "uart.h"