C :: Error Including Undeclared Structure

I get this error :

stra.c:54:29: error: "PS_index" undeclared (first use in this function)

and the function is

PS_Index = function(PS_index, indexData);

so what i am trying to do is :

first file:

Code:
#include <stdio.h>
#include <stdlib.h>
#include "stra.h"
int main (){
char name[] = "index.pif";
uint32_t i = 0;

[Code] .....

And header file:

Code:
typedef struct StraIndex{
uint32_t s;
uint32_t *i;
uint32_t *t;
}StraIndex; s

So first I would like to create my stra.o so i compile it as :

gcc -c stra.c -o stra.o

and then i get the above error. What would be the proper way to get a global structure inside my object.