Hi, I tried to compile sample aplication pjsua_app.c; located at=>pjsip-apps/src/pjsua/pjsua_app.c I also made make file => all:pjsua_app pjsua_app:pjsua_app.c $(CC) -o $@ $< `pkg-config --cflags --libs libpjproject` clean: rm -f pjsua_app.o pjsua_app when i tried to compile it i got following error, please suggest if i missed something. root at ubuntu:/home/test/Desktop/sip/pjsua# make cc -o pjsua_app pjsua_app.c `pkg-config --cflags --libs libpjproject` pjsua_app.c: In function ?parse_args?: pjsua_app.c:822: warning: ignoring return value of ?freopen?, declared with attribute warn_unused_result /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start': (.text+0x18): undefined reference to `main' collect2: ld returned 1 exit status make: *** [pjsua_app] Error 1 Best Regards,Sakharam Thorat. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130405/fd974735/attachment-0001.html>