fix build by guessing types of missing values -feeling lucky

libs/spandsp/src/spandsp/private/t30.h

@@ -207,6 +207,13 @@ struct t30_state_s
     /*! \brief This is only used in full duplex (e.g. ISDN) modes. */
     int timer_t8;
 
+	/* These fields are guessed based on compiler error forensics, I added them to fix the build -anthm */
+	int remote_interrupts_allowed;
+	int rtp_events;
+	int rtn_events;
+	int retransmit_capable;
+	/* end guessed fields */
+
     /*! \brief TRUE once the far end FAX entity has been detected. */
     int far_end_detected;
 

libs/spandsp/src/spandsp/t30.h

@@ -682,6 +682,8 @@ SPAN_DECLARE(void) t30_get_transfer_statistics(t30_state_t *s, t30_stats_t *t);
     \param state TRUE to enable interrupt request, else FALSE. */
 SPAN_DECLARE(void) t30_local_interrupt_request(t30_state_t *s, int state);
 
+SPAN_DECLARE(void) t30_remote_interrupts_allowed(t30_state_t *s, int state);
+
 #if defined(__cplusplus)
 }
 #endif