yun does not define LED_BUILTIN

[jantje]

This sketch does not compile on the yun because LED_BUILTIN is not defined.
It works for the UNO.

int led = LED_BUILTIN;

// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}

[ffissore]

Fixed. It'll be available in the next nightly (tomorrow) build and in the next release