[Freeswitch-users] Cannot compile freetdm!

[Valery Kalinin]

# cd /usr/local/freeswitch/libs/freetdm
# ./configure --with-libisdn
# make

bla-bla-bla

cc1: warnings being treated as errors
src/ftmod/ftmod_isdn/ftmod_isdn.c: In function 'ftdm_isdn_931_34':
src/ftmod/ftmod_isdn/ftmod_isdn.c:982: warning: unused variable 'cplen'
src/ftmod/ftmod_isdn/ftmod_isdn.c: In function 'isdn_configure_span':
src/ftmod/ftmod_isdn/ftmod_isdn.c:2794: warning: passing argument 2 of
'Q931SetLogCB' from incompatible pointer type
make: *** [ftmod_isdn_la-ftmod_isdn.lo] Error 1

Why?
libisdn-0.0.1 installed