Hi, I've installed the PJSIP libraries as explained at http://trac.pjsip.org/repos/wiki/Getting-Started/Autoconf#Runningconfigure.? I've then created a C project with Makefile as follows:? all: mix mix: mix.c $(CC) -o $@ $< `pkg-config --cflags --libs libpjproject` clean: rm -f mix.o mix And, when I build the project, I get the following error: 11:09:26 **** Incremental Build of configuration Debug for project Mix **** make all cc -o mix mix.c `pkg-config --cflags --libs libpjproject` /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(conference.o): In function `create_sound_port': conference.c:(.text+0x692): undefined reference to `pjmedia_aud_stream_get_param' conference.c:(.text+0x6b3): undefined reference to `pjmedia_aud_dev_get_info' conference.c:(.text+0x745): undefined reference to `pjmedia_aud_dev_get_info' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(endpoint.o): In function `pjmedia_endpt_create': endpoint.c:(.text+0x14f): undefined reference to `pjmedia_aud_subsys_init' endpoint.c:(.text+0x1b0): undefined reference to `pjmedia_aud_subsys_shutdown' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(endpoint.o): In function `pjmedia_endpt_destroy': endpoint.c:(.text+0x4fd): undefined reference to `pjmedia_aud_subsys_shutdown' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_destroy': sound_port.c:(.text+0x2e6): undefined reference to `pjmedia_aud_stream_stop' sound_port.c:(.text+0x2f2): undefined reference to `pjmedia_aud_stream_destroy' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_set_ec': sound_port.c:(.text+0x3ec): undefined reference to `pjmedia_aud_stream_get_param' sound_port.c:(.text+0x515): undefined reference to `pjmedia_aud_stream_get_cap' sound_port.c:(.text+0x561): undefined reference to `pjmedia_aud_stream_set_cap' sound_port.c:(.text+0x5cf): undefined reference to `pjmedia_aud_stream_set_cap' sound_port.c:(.text+0x60e): undefined reference to `pjmedia_aud_stream_set_cap' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `start_sound_device': sound_port.c:(.text+0x7a0): undefined reference to `pjmedia_aud_stream_create' sound_port.c:(.text+0x815): undefined reference to `pjmedia_aud_stream_destroy' sound_port.c:(.text+0x845): undefined reference to `pjmedia_aud_stream_start' sound_port.c:(.text+0x85c): undefined reference to `pjmedia_aud_stream_destroy' sound_port.c:(.text+0x899): undefined reference to `pjmedia_aud_dev_get_info' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_create_player': sound_port.c:(.text+0xb14): undefined reference to `pjmedia_aud_dev_default_param' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_create_rec': sound_port.c:(.text+0xbe4): undefined reference to `pjmedia_aud_dev_default_param' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_create': sound_port.c:(.text+0xcb4): undefined reference to `pjmedia_aud_dev_default_param' /usr/local/lib/libpjmedia-x86_64-unknown-linux-gnu.a(sound_port.o): In function `pjmedia_snd_port_get_ec_tail': sound_port.c:(.text+0xdd2): undefined reference to `pjmedia_aud_stream_get_cap' sound_port.c:(.text+0xe08): undefined reference to `pjmedia_aud_stream_get_cap' collect2: ld returned 1 exit status make: *** [mix] Error 1 11:09:26 Build Finished (took 415ms) I precise that building another sample (pcaputil) works properly using exactly the same steps. Thanks, Mickael -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20140413/73d0732d/attachment.html>