-extern struct utcp *utcp_init(utcp_accept_t accept, utcp_pre_accept_t pre_accept, utcp_send_t send, void *priv);
-extern void utcp_exit(struct utcp *utcp);
-
-extern struct utcp_connection *utcp_connect_ex(struct utcp *utcp, uint16_t port, utcp_recv_t recv, void *priv, uint32_t flags);
-extern struct utcp_connection *utcp_connect(struct utcp *utcp, uint16_t port, utcp_recv_t recv, void *priv);
-extern void utcp_accept(struct utcp_connection *utcp, utcp_recv_t recv, void *priv);
-extern ssize_t utcp_send(struct utcp_connection *connection, const void *data, size_t len);
-extern ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len);
-extern int utcp_close(struct utcp_connection *connection);
-extern int utcp_abort(struct utcp_connection *connection);
-extern int utcp_shutdown(struct utcp_connection *connection, int how);
-extern struct timespec utcp_timeout(struct utcp *utcp);
-extern void utcp_set_recv_cb(struct utcp_connection *connection, utcp_recv_t recv);
-extern void utcp_set_poll_cb(struct utcp_connection *connection, utcp_poll_t poll);
-extern void utcp_set_accept_cb(struct utcp *utcp, utcp_accept_t accept, utcp_pre_accept_t pre_accept);
-extern bool utcp_is_active(struct utcp *utcp);
-extern void utcp_abort_all_connections(struct utcp *utcp);
+struct utcp *utcp_init(utcp_accept_t accept, utcp_pre_accept_t pre_accept, utcp_send_t send, void *priv);
+void utcp_exit(struct utcp *utcp);
+
+struct utcp_connection *utcp_connect_ex(struct utcp *utcp, uint16_t port, utcp_recv_t recv, void *priv, uint32_t flags);
+struct utcp_connection *utcp_connect(struct utcp *utcp, uint16_t port, utcp_recv_t recv, void *priv);
+void utcp_accept(struct utcp_connection *utcp, utcp_recv_t recv, void *priv);
+ssize_t utcp_send(struct utcp_connection *connection, const void *data, size_t len);
+ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len);
+int utcp_close(struct utcp_connection *connection);
+int utcp_abort(struct utcp_connection *connection);
+int utcp_shutdown(struct utcp_connection *connection, int how);
+struct timespec utcp_timeout(struct utcp *utcp);
+void utcp_set_recv_cb(struct utcp_connection *connection, utcp_recv_t recv);
+void utcp_set_poll_cb(struct utcp_connection *connection, utcp_poll_t poll);
+void utcp_set_accept_cb(struct utcp *utcp, utcp_accept_t accept, utcp_pre_accept_t pre_accept);
+bool utcp_is_active(struct utcp *utcp);
+void utcp_abort_all_connections(struct utcp *utcp);