Hello there, I am working on PJSIP on linux. I have tried develop PJSIP video conference. I have already install pjproject on github than I wrote that commands: ./configure --enable-shared --disable-static --enable-memalign-hack make && make install After that commands I want to compile vidgui. cd /pjproject/pjsip-apps/src/vidgui qmake make and I get these compile errors. /home/furkan/pjproject/pjsip-apps/src/vidgui/vidgui.cpp:238: undefined reference to `pjsua_vid_preview_stop' /home/furkan/pjproject/pjsip-apps/src/vidgui/vidgui.cpp:248: undefined reference to `pjsua_vid_preview_param_default' /home/furkan/pjproject/pjsip-apps/src/vidgui/vidgui.cpp:252: undefined reference to `pjsua_vid_preview_start' /home/furkan/pjproject/pjsip-apps/src/vidgui/vidgui.cpp:259: undefined reference to `pjsua_vid_preview_get_win' /home/furkan/pjproject/pjsip-apps/src/vidgui/vidgui.cpp:260: undefined reference to `pjsua_vid_win_get_info' vidgui.o: In function `MainWin::initVideoWindow()': /home/furkan/pjproject/pjsip-apps/src/vidgui/vidgui.cpp:339: undefined reference to `pjsua_vid_win_get_info' Is there anything to compile except from it. Best regards. Furkan Karakaya