Hi All, I installed FreeSwitch and now I am trying to add gsmopen module. I edited the modules.conf file and uncommented the line "endpoints/mod_gsmopen" Now While running the command "make install all" , I am getting this error - ================================================== making install mod_gsmopen make[4]: Entering directory `/usr/local/src/freeswitch/src/mod/endpoints/mod_gsmopen' make install-am make[5]: Entering directory `/usr/local/src/freeswitch/src/mod/endpoints/mod_gsmopen' CXX mod_gsmopen_la-mod_gsmopen.lo In file included from mod_gsmopen.cpp:34:0: gsmopen.h:103:26: fatal error: ctb-0.16/ctb.h: No such file or directory #include "ctb-0.16/ctb.h" ^ compilation terminated. make[5]: *** [mod_gsmopen_la-mod_gsmopen.lo] Error 1 make[5]: Leaving directory `/usr/local/src/freeswitch/src/mod/endpoints/mod_gsmopen' make[4]: *** [install] Error 2 make[4]: Leaving directory `/usr/local/src/freeswitch/src/mod/endpoints/mod_gsmopen' make[3]: *** [mod_gsmopen-install] Error 1 make[3]: Leaving directory `/usr/local/src/freeswitch/src/mod' make[2]: *** [install-recursive] Error 1 make[2]: Leaving directory `/usr/local/src/freeswitch/src' make[1]: *** [install-recursive] Error 1 make[1]: Leaving directory `/usr/local/src/freeswitch' make: *** [install] Error 2 ======================================================== [image: Inline image 1] Please help me resolving this error. Anurag Rana <https://sites.google.com/site/homepagerana/> M.Tech CSE, IIIT-Delhi, https://sites.google.com/site/homepagerana/