Hi FS List, FYI - as a shortcut to building my freeswitch, I skip spandsp - but it looks like this mod_gsmopen wants it in there. [root@space build]# cd /usr/src/freeswitch/src/mod/endpoints/mod_gsmopen/ [root@space mod_gsmopen]# make clean [root@space mod_gsmopen]# make install Compiling gsmopen_protocol.cpp... Compiling /usr/src/freeswitch/src/mod/endpoints/mod_gsmopen/mod_gsmopen.cpp... mkdir .libs Compiling /usr/src/freeswitch/src/mod/endpoints/mod_gsmopen/mod_gsmopen.cpp ... Creating mod_gsmopen.so... /usr/bin/ld: cannot find -lspandsp collect2: ld returned 1 exit status g++ -I../../../../libs/spandsp/src -I../../../..//libs/tiff-3.8.2/libtiff -DGSMOPEN_C_VER=\"44fd0de\" -DMODGSMOPEN_C_VER=\"44fd0de\" -I/usr/src/freeswitch/libs/curl/include -I/usr/src/freeswitch/src/include -I/usr/src/freeswitch/src/include -I/usr/src/freeswitch/libs/libteletone/src -fPIC -fvisibility=hidden -DSWITCH_API_VISIBILITY=1 -DHAVE_VISIBILITY=1 -g -O2 -D_GNU_SOURCE -shared -o .libs/mod_gsmopen.so -shared -Wl,-x .libs/mod_gsmopen.o gsmopen_protocol.o -lm /usr/src/freeswitch/.libs/libfreeswitch.so -L/usr/src/freeswitch/libs/apr-util/xml/expat/lib /usr/src/freeswitch/libs/apr-util/xml/expat/lib/.libs/libexpat.a /usr/src/freeswitch/libs/apr/.libs/libapr-1.a -luuid -lpthread -L/usr/src/freeswitch/libs/srtp -L/usr/kerberos/lib -lcrypt -lrt -lssl -lcrypto -ldl -lz -lncurses -ljpeg -L/usr/src/freeswitch/libs/spandsp/src -lspandsp -lctb-0.16 -lgsmme -Wl,--rpath -Wl,/usr/local/freeswitch/lib -Wl,--rpath -Wl,/usr/local/freeswitch/mod make[1]: *** [mod_gsmopen.so] Error 1 make: *** [install] Error 1