-extern splay_node_t *splay_search_node(splay_tree_t *, const void *);
-extern splay_node_t *splay_search_closest_node(splay_tree_t *, const void *, int *);
-extern splay_node_t *splay_search_closest_node_nosplay(const splay_tree_t *, const void *, int *);
-extern splay_node_t *splay_search_closest_smaller_node(splay_tree_t *, const void *);
-extern splay_node_t *splay_search_closest_greater_node(splay_tree_t *, const void *);
+splay_node_t *splay_search_node(splay_tree_t *, const void *);
+splay_node_t *splay_search_closest_node(splay_tree_t *, const void *, int *);
+splay_node_t *splay_search_closest_node_nosplay(const splay_tree_t *, const void *, int *);
+splay_node_t *splay_search_closest_smaller_node(splay_tree_t *, const void *);
+splay_node_t *splay_search_closest_greater_node(splay_tree_t *, const void *);