vectp = (char **)destp;
	if (imgp->auxargs) {
		/*
		 * Allocate room on the stack for the ELF auxargs
		 * array.  It has up to AT_COUNT entries each of which
		 * contains 2 pointers.
		 */
		vectp -= AT_COUNT * 2;
	}

	/*
	 * Allocate room for the argv[] and env vectors including the
	 * terminating NULL pointers.
	 */
	vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;