1 files changed, 23 insertions, 0 deletions
diff --git a/Common.mk b/Common.mk
index 0c1bc0b..b77c644 100644
--- a/Common.mk
+++ b/Common.mk
@@ -46,6 +46,29 @@ endif
 $(call show_config_variable,CURRENT_OS,[AUTODETECTED])
 
 ########################################################################
+# Arduino Directory
+
+ifndef ARDUINO_DIR
+    AUTO_ARDUINO_DIR := $(firstword \
+        $(call dir_if_exists,/usr/share/arduino) \
+        $(call dir_if_exists,/Applications/Arduino.app/Contents/Resources/Java) )
+    ifdef AUTO_ARDUINO_DIR
+       ARDUINO_DIR = $(AUTO_ARDUINO_DIR)
+       $(call show_config_variable,ARDUINO_DIR,[AUTODETECTED])
+    else
+        echo $(error "ARDUINO_DIR is not defined")
+    endif
+else
+    $(call show_config_variable,ARDUINO_DIR,[USER])
+endif
+
+ifeq ($(CURRENT_OS),WINDOWS)
+    ifneq ($(shell echo $(ARDUINO_DIR) | egrep '^(/|[a-zA-Z]:\\)'),)
+        echo $(error On Windows, ARDUINO_DIR must be a relative path)
+    endif
+endif
+
+########################################################################
 #
 # Travis-CI
 ifneq ($(TEST),)