Redefinition

Hi

i wrote the code below for a T89C51CC01 atmel's controller.When i tried to build it, it gives the following error message:(Build target 'Target 1'
compiling xixi.c...
XIXI.C(7): error C231: 'P1': redefinition
XIXI.C(8): error C231: 'P3': redefinition
Target not created)

These errors are caused by the 2 first lines after the include statements(sfr P1 = 0x90; sfr P3 = 0xB0;)



Can anyone help me?
The code:
#include <absacc.h>
#include <string.h>
#include <stdio.h>
#include <REG51CC01.H>


sfr P1 = 0x90;
sfr P3 = 0xB0;

sbit DIPswitch = P1^4;
sbit greenLED = P1^5;

void main (void) {
unsigned char inval;

inval = 0; // initial value for inval

while (1) {
if (DIPswitch == 1) { // check if input P1.4 is high
inval = P1 & 0x0F; // read bit 0 .. 3 from P1
greenLED = 0; // set output P1.5 to low
}
else { // if input P1.4 is low
greenLED = 1; // set output P1.5 to high
}
P3 = (P3 & 0xF0) | inval; // output inval to P3.0 .. P3.3
}
}