undefined reference to `STATIC_FUNCTION' collect2: error: ld returned 1 exit status

main.c

#include <stdio.h>
#include <string.h>

static int static_function(int i) {
    printf("%i", i);
    return i;
}


static void *IMPORT_q[] = { (void *)static_function };

void main()
{
    STATIC_FUNCTION(8);
    return;
}

main.h

static void **IMPORT_q = NULL;
static int static_function(int i) ;

#define FUNCTION_INDX           0
#define STATIC_FUNCTION         (*(int)IMPORT_q[FUNCTION_INDX])