making install mod_freetdm
  CC ftmod_sangoma_isdn_la-ftmod_sangoma_isdn.lo
cc1: warnings being treated as errors
src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c: In function 'ftdm_sangoma_isdn_io_run':
src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c:345: warning: 'i' may be used uninitialized in this function
make[6]: *** [ftmod_sangoma_isdn_la-ftmod_sangoma_isdn.lo] Error 1
make[5]: *** [local_install] Error 2
make[4]: *** [install] Error 1
make[3]: *** [mod_freetdm-install] Error 1
make[2]: *** [install-recursive] Error 1
make[1]: *** [install-recursive] Error 1
make: *** [install] Error 2

Fix is to initialize variable "i".

--- a/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c
+++ b/libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn.c
@@ -342,7 +342,7 @@ static void ftdm_sangoma_isdn_wakeup_phy(ftdm_channel_t *dchan)
 static void *ftdm_sangoma_isdn_io_run(ftdm_thread_t *me, void *obj)
 {
        uint8_t data[1000];
- unsigned i;
+ unsigned i = 0;
        ftdm_status_t status = FTDM_SUCCESS;
        ftdm_wait_flag_t wflags = FTDM_READ;
        ftdm_span_t *span = (ftdm_span_t*) obj;