Error: redefinition of typedef 'list_t

I am getting following error on compiling using gcc. I am currently using gcc version 3.4.6 Can any one tell me what is wrong in the code. And how can I recover from this.

list.h:39: error: redefinition of typedef 'list_t'
list.h:29: error: previous declaration of 'list_t' was here

The def in list.h is as as shown below.

Code:

#ifndef _LIST_H
#define _LIST_H


typedef struct list_t list_t;

typedef struct
{
        void                    *next;          
        void                    *prev;         
        void                    *data;         
        int                     datasize;

        list_t                  *list;        
} list_item_t;


typedef struct list_t
{
        list_item_t             *head;         
        list_item_t             *tail;         

        list_item_t             *pMark;       

        list_t                  *pPar;      
} list_t;


#endif

You can remove this line:

Code:

typedef struct list_t list_t;

Or you can remove the typedef from the definition of struct list_t.

By the way, do not use _LIST_H for your header inclusion guard. Names that begin with an underscore followed by an uppercase letter are reserved to the implementation for any use.