SSE codes for 1-D ARRAYS, compiler error: "Cannot open include file".

fatal error C1083: Cannot open include file: 'altivec.h': No such file or directory

#include "stdafx.h"
#include <iostream>
#include <altivec.h>
#include <xmmintrin.h>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
    int a[4] __attribute__((aligned(16))) = { 1, 3, 5, 7 };
    int b[4] __attribute__((aligned(16))) = { 2, 4, 6, 8 };
    int c[4] __attribute__((aligned(16)));
    __vector signed int *va = (__vector signed int *) a;
    __vector signed int *vb = (__vector signed int *) b;
    __vector signed int *vc = (__vector signed int *) c;

    *vc = vec_add(*va, *vb);
    printf("c[0]=%d, c[1]=%d, c[2]=%d, c[3]=%d¥n", c[0], c[1], c[2], c[3]);
    return 0;
}