error

clang -DPACKAGE_NAME=\"shmup\" -DPACKAGE_TARNAME=\"shmup\" -DPACKAGE_VERSION=\"0.1\" -DPACKAGE_STRING=\"shmup\ 0.1\" -DPACKAGE_BUGREPORT=\"[email protected]\" -DPACKAGE=\"shmup\" -DVERSION=\"0.1\" -I.     -D_GNU_SOURCE=1 -D_THREAD_SAFE -I/usr/local/include/SDL   -D_GNU_SOURCE=1 -D_THREAD_SAFE -I/usr/local/include/SDL   -Wall -Werror -ansi -finline-functions -g -O2 -MT shmup-sprite_stack.o -MD -MP -MF .deps/shmup-sprite_stack.Tpo -c -o shmup-sprite_stack.o `test -f 'sprite_stack.c' || echo './'`sprite_stack.c
In file included from sprite_stack.c:1:
./sprite_stack.h:9:5: error: unknown type name 'sprite_node'
    sprite_node *previous;
    ^
./sprite_stack.h:10:5: error: unknown type name 'sprite_node'
    sprite_node *next;
    ^
2 errors generated.
make[1]: *** [shmup-sprite_stack.o] Error 1
make: *** [all-recursive] Error 1

sprite_stack.h

#ifndef H_SPRITE_STACK
#define H_SPRITE_STACK

#include "graphics.h"

typedef struct {
    sprite *sprite;

    sprite_node *previous;
    sprite_node *next;
} sprite_node;

sprite_node *first;
sprite_node *last;

void stack_remove(sprite_node *node);
void stack_push(sprite_node *node);
#endif