Eclipse+AVR插件，找不到Serial定义

大柳树伯爵

#include "Arduino.h"
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;

// 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
  Serial.println("test");
}

int main(void)
{
    init();
    setup();

    while (1)
    {
        loop();
    }

    return 0;

}


代码如上，请教在非Arduino IDE环境下，应该如何引入核心库头文件，谢谢！

j2ev4p