Why struct parport ERROR?

mygod100

I want to use parallel port,so I

vi main.cpp

1. 
   
2. #include <linux/parport.h>
   
3. int main()
   
4. {
   
5.   struct parport pp;
   
6. }
   

复制代码

g++ main.cpp

main.cpp: In function `int main()':
main.cpp:5: aggregate `parport pp' has incomplete type and cannot be defined

HOW CAN I TO USE the struct parpart ????
thank you!