k5_key_register
err = k5_key_register(K5_KEY_GSS_KRB5_SET_CCACHE_OLD_NAME, free);
err = k5_key_register(K5_KEY_GSS_KRB5_CCACHE_NAME, free);
err = k5_key_register(K5_KEY_GSS_KRB5_ERROR_MESSAGE,
err = k5_key_register(K5_KEY_GSS_SPNEGO_ERROR_MESSAGE,
err = k5_key_register(K5_KEY_GSS_SPNEGO_ERROR_MESSAGE,
extern int k5_key_register(k5_key_t, void (*)(void *));