AVR-Chat

I'm trying to declare a structure but I keep getting an error like this
or similar depending on were I try to put __attribute__.

error: expected '=', ',', ';', 'asm' or '__attribute__' before 'struct'

Does avr-gcc allow plain-old structures? How should I write this to get 
it to compile?

struct __attribute__ ((__packed__)) rb_fifo_struct_type 
{
    uint8_t *head;
    uint8_t *tail;
    uint8_t *dptr;
};
typedef struct rb_fifo_struct_type rbuff_t;