SIMD program compilation issue

I have a simple SIMD program for vector addition

/*
 * FILE: vec_add.c
 */
#include <stdio.h>
#include <altivec.h>

/*
 * declares input/output scalar varialbes
 */
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)));

int main(int argc, char **argv)
{
    /*
     * declares vector variables which points to scalar arrays
     */
    __vector signed int *va = (__vector signed int *) a;
    __vector signed int *vb = (__vector signed int *) b;
    __vector signed int *vc = (__vector signed int *) c;

    /*
     * adds four signed intergers at once
     */
    *vc = vec_add(*va, *vb);    // 1 + 2, 3 + 4, 5 + 6, 7 + 8

    /*
     * output results
     */
    printf("c[0]=%d, c[1]=%d, c[2]=%d, c[3]=%d\n", c[0], c[1], c[2], c[3]);

    return 0;
}

I am trying to compile this program using the Makefile here

CC     = gcc
CFLAGS = -maltivec -mabi=altivec

SOURCE = vec_add.c
TARGET = vec_add.elf

$(TARGET): $(SOURCE)
    $(CC) $(CFLAGS) $^ -o $@

clean:
    rm -f *.elf

On compiling the program ..I am getting the following error

pp@pa-Inspiron-N5050:~/Desktop/Proj/SIMD$ make
gcc -maltivec -mabi=altivec vec_add.c -o vec_add.elf
gcc: error: unrecognized argument in option ‘-mabi=altivec’
gcc: note: valid arguments to ‘-mabi=’ are: ms sysv
gcc: error: unrecognized command line option ‘-maltivec’
make: *** [vec_add.elf] Error 1

On simply compiling without using Makefile. I am getting

SIMD$ gcc vec_add.c
vec_add.c:5:21: fatal error: altivec.h: No such file or directory
 #include <altivec.h>
                     ^
compilation terminated.

So, I downloaded the altivec.h file and put it in the folder but still it is giving the same error.

I dont understand what is the issue with using -maltivec option. Is there some other way of compiling this?

Your program is written for PowerPC Altivec (aka VMX) SIMD extension, and your compiler is for x86. You should either use PowerPC cross-compiler or rewrite your code for x86 SIMD extensions (SSE or AVX).