diff --git a/.gitignore b/.gitignore
index 096a754..fed7346 100644
--- a/.gitignore
+++ b/.gitignore
@@ -103,3 +103,4 @@ local.properties
 .cache-main
 .scala_dependencies
 .worksheet
+/Release/
diff --git a/Makefile b/Makefile
index 5ba8446..72b33da 100644
--- a/Makefile
+++ b/Makefile
@@ -8,5 +8,7 @@ PSRC += arduino_core/ArduinoCore-avr/libraries/SPI/src/SPI.cpp
 # extra Arduino libraries
 ARDLIBS = 				
 
+EXTRAINCDIRS = arduino_core/ArduinoCore-avr/libraries/SPI/src
+
 # this line includes the Makefile.base
 include arduino_core/arduino-base.mk
diff --git a/arduino_core b/arduino_core
index 12822f7..527ec73 160000
--- a/arduino_core
+++ b/arduino_core
@@ -1 +1 @@
-Subproject commit 12822f737d00f0d00c202fa57750676a0596f50d
+Subproject commit 527ec7353dc51c35168c2b77e7981e6329323f89
diff --git a/main.cpp b/main.cpp
index 4a2ce87..c46720e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -8,7 +8,7 @@
 
 //SPI is formally a library, so it is not part of the objects compiled
 //from the core and we need to include it explicitly
-#include "arduino_core/ArduinoCore-avr/libraries/SPI/src/SPI.h"
+#include <SPI.h>
 
 //Define which port to use for the SPI Chip Select
 #define CS_PORT PORTC