extern DRIVER imapdriver; 
extern DRIVER nntpdriver; 
extern DRIVER pop3driver; 
extern DRIVER mbxdriver; 
extern DRIVER mtxdriver; 
extern DRIVER tenexdriver; 
extern DRIVER unixdriver; 
extern DRIVER dummydriver; 
#define CREATEPROTO mbxproto 
#define APPENDPROTO unixproto 
extern AUTHENTICATOR auth_ext; 
extern AUTHENTICATOR auth_gss; 
extern AUTHENTICATOR auth_md5; 
extern AUTHENTICATOR auth_pla; 
extern AUTHENTICATOR auth_log; 
