Problema sketch per mouse ps2

Ho recuperato un mouse ps2, ma non riesco a compilare lo sketch di esempio contenuto nella libreria:
http://playground.arduino.cc/componentLib/Ps2mouse

#include <ps2.h>

/*
 * an arduino sketch to interface with a ps/2 mouse.
 * Also uses serial protocol to talk back to the host
 * and report what it finds.
 */

/*
 * Pin 5 is the mouse data pin, pin 6 is the clock pin
 * Feel free to use whatever pins are convenient.
 */
PS2 mouse(6, 5);

/*
 * initialize the mouse. Reset it, and place it into remote
 * mode, so we can get the encoder data on demand.
 */
void mouse_init()
{
  mouse.write(0xff);  // reset
  mouse.read();  // ack byte
  mouse.read();  // blank */
  mouse.read();  // blank */
  mouse.write(0xf0);  // remote mode
  mouse.read();  // ack
  delayMicroseconds(100);
}

void setup()
{
  Serial.begin(9600);
  mouse_init();
}

/*
 * get a reading from the mouse and report it back to the
 * host via the serial line.
 */
void loop()
{
  char mstat;
  char mx;
  char my;

  /* get a reading from the mouse */
  mouse.write(0xeb);  // give me data!
  mouse.read();      // ignore ack
  mstat = mouse.read();
  mx = mouse.read();
  my = mouse.read();

  /* send the data back up */
  Serial.print(mstat, BIN);
  Serial.print("\tX=");
  Serial.print(mx, DEC);
  Serial.print("\tY=");
  Serial.print(my, DEC);
  Serial.println();
//  delay(20);  /* twiddle */
}

Gli errori che ricevo sono:

In file included from ps2_mouse.pde:1:
C:\Program Files\Arduino\libraries\ps2/ps2.h:11:22: error: WProgram.h: No such file or directory

Qualcuno sa come risolvere?

si. ]:)

EDIT: Vabbè... te lo dico... Letto da qui --> http://playground.arduino.cc/componentLib/Ps2mouse

Update 18 May 2012 As of Arduino 1.0 ps2.zip should be unpacked into arduino/libraries. And in ps2.h replace "WProgram.h" with "Arduino.h".

PaoloP: si. ]:)

EDIT: Vabbè... te lo dico... Letto da qui --> http://playground.arduino.cc/componentLib/Ps2mouse

Update 18 May 2012 As of Arduino 1.0 ps2.zip should be unpacked into arduino/libraries. And in ps2.h replace "WProgram.h" with "Arduino.h".

Ok, risolto. Grazie mille :)