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struct hack flexArrayStruct{
  int num;
  char my_char;
  int data[];
};

...
/* Space is allocated for the struct */
struct hackflexArrayStruct *hackPstructP = malloc(sizeof(struct hackflexArrayStruct) + sizeof(int) * ARRAY_SIZE);
if (!hackPstructP) {
     /* handle malloc failure */
}
hackP
/* Now, it is as if the struct were defined
	struct {int num; char my_char; int data[ARRAY_SIZE];} *structP;
and we can access the elements as if they were so. */
structP->num = SOME_NUMBER;
hackPstructP->my_char = SOME_CHAR;

/* Access data[] as if array had been allocated as data[ARRAY_SIZE] */
for (i = 0; i < ARRAY_SIZE; i++) {
  hackPstructP->data[i] = i;
}