Centos 6.7 final     Linux localhost.localdomain 3.10.40-1.el6.elrepo.i686

cd /usr/src/freeswitch/src/mod/endpoints/mod_gsmopen/libctb-0.16/build
make DEBUG=0 GPIB=0
g++ -c -o release/ctb_lib_portscan.o -DNDEBUG  -D_THREAD_SAFE -pthread -O0 -I../include   -MTrelease/ctb_lib_portscan.o -MF`echo release/ctb_lib_portscan.o | sed -e 's,\.o$,.d,'` -MD -MP ../src/portscan.cpp
In file included from ../include/ctb-0.16/linux/serport.h:12,
                 from ../include/ctb-0.16/serport.h:15,
                 from ../include/ctb-0.16/ctb.h:12,
                 from ../src/portscan.cpp:1:
../include/ctb-0.16/serportx.h: In member function ‘char* ctb::SerialPort_DCS::GetSettings()’:
../include/ctb-0.16/serportx.h:178: error: ‘_snprintf’ was not declared in this scope
make: *** [release/ctb_lib_portscan.o] Error 1

any solution ?