Hi, I was trying to build freeswitch with cepstral enabled. Here is the procdure i am following: http://wiki.freeswitch.org/wiki/Mod_cepstral#Can_I_use_a_16khz_.22desktop_vo... Unfortunately, the build fails as show in the log message hereunder. In a previous thread, Brian says that the SDK is needed. Yet on the above wiki page, it is said that the SDK is not needed. Any suggestion? Max. Compiling mod_cepstral.c ... Creating mod_cepstral.so... /usr/bin/ld: skipping incompatible /opt/swift/lib/libswift.so when searching for -lswift /usr/bin/ld: cannot find -lswift collect2: ld returned 1 exit status gcc -w -I/home/installs/freeswitch/src/include -I/home/installs/freeswitch/libs/libteletone/src -fPIC -Werror -fvisibility=hidden -DSWITCH_API_VISIBILITY=1 -DHAVE_VISIBILITY=1 -g -ggdb -g -O2 -Wall -std=c99 -pedantic -D_GNU_SOURCE -I/include -I/opt/swift/include -shared -o .libs/mod_cepstral.so -shared -Wl,-x .libs/mod_cepstral.o -L/lib -L/opt/swift/lib -lswift -lm /home/installs/freeswitch/.libs/libfreeswitch.so -L/home/installs/freeswitch/libs/apr-util/xml/expat/lib /home/installs/freeswitch/libs/apr-util/xml/expat/lib/.libs/libexpat.a /home/installs/freeswitch/libs/apr/.libs/libapr-1.a -luuid -lrt -lcrypt -lpthread -L/home/installs/freeswitch/libs/srtp -L/usr/kerberos/lib64 -lssl -lcrypto -ldl -lz -lncurses -Wl,--rpath -Wl,/usr/local/freeswitch/lib -Wl,--rpath -Wl,/usr/local/freeswitch/mod make[5]: *** [mod_cepstral.so] Error 1 make[4]: *** [all] Error 1 make[3]: *** [mod_cepstral-all] Error 1 make[2]: *** [all-recursive] Error 1 Making all in build +-------- FreeSWITCH Build Complete -----------+ + FreeSWITCH has been successfully built. + + Install by running: + + + + make install + +----------------------------------------------+ make[1]: *** [all-recursive] Error 1 make: *** [all] Error 2