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-rwxr-xr-xcores/arduino/HardwareSerial.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index 712a4c7..638b6d1 100755
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -19,6 +19,7 @@
Modified 23 November 2006 by David A. Mellis
*/
+#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>