LCD4BIT problems on Arduino 1.0

Development Libraries
8

I´m using the Arduino 1.0.3.
I downloaded the library in: C:\Program Files (x86)\arduino-1.0.3\libraries\LCD4Bit_mod
In file LCD4Bit_mod.cpp I modified:

#include "LCD4Bit_mod.h"
#include "Arduino.h"
extern "C" {
#include <stdio.h> //not needed yet
#include <string.h> //needed for strlen()
#include <inttypes.h>
// #include "WConstants.h" //all things wiring / arduino
}

and...It works fine.