我正在使用OpenSSL + SWIG制作python模块时出现链接问题

%module udp

%{
 /* Put header files here or function declarations like below */

 #define SWIG_FILE_WITH_INIT
 #include \"dtls_udp_echo.h\"

%}

int THREAD_setup();

int THREAD_cleanup();

int handle_socket_error();

int generate_cookie(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len);

int verify_cookie(SSL *ssl, unsigned char *cookie, unsigned int cookie_len);

int dtls_verify_callback (int ok, X509_STORE_CTX *ctx) ;

void* connection_handle(void *info);

void start_server(int port, char *local_address);

void start_client(char *remote_address, char *local_address, int port, int length, int messagenumber);

>>> import udp
> Traceback (most recent call last):  
> File \"<stdin>\", line 1, in <module>  
> File \"udp.py\", line 28, in <module>
>     import _udp ImportError: ./_udp.so: undefined symbol:
> SSL_get_rbio