Using pjsua2 with 3rd party media - media

Question

I am trying to use pjsua (pjproject-2.10) for ubuntu(x86_64) system but I want to use a third party media library as per the instructions given in the link:
Integrating Third Party Media Stack into PJSUA-LIB.
My modified config_site.h (placed at path pjlib/include/pj/config_site.h) is as follows:
#define PJSUA_MEDIA_HAS_PJMEDIA 0
#define THIRD_PARTY_MEDIA 1
#if THIRD_PARTY_MEDIA
/*
* Sample settings for using third party media with pjsua-lib
*/
# define PJMEDIA_HAS_G711_CODEC 0
# define PJMEDIA_HAS_ALAW_ULAW_TABLE 0
# define PJMEDIA_RESAMPLE_IMP PJMEDIA_RESAMPLE_NONE
# define PJMEDIA_HAS_SPEEX_AEC 0
# define PJMEDIA_HAS_L16_CODEC 0
# define PJMEDIA_HAS_GSM_CODEC 0
# define PJMEDIA_HAS_SPEEX_CODEC 0
# define PJMEDIA_HAS_ILBC_CODEC 0
# define PJMEDIA_HAS_G722_CODEC 0
# define PJMEDIA_HAS_G7221_CODEC 0
# define PJMEDIA_HAS_OPENCORE_AMRNB_CODEC 0
# define PJMEDIA_HAS_VIDEO 0
# define PJMEDIA_HAS_FFMPEG 0
# undef PJMEDIA_VIDEO_DEV_HAS_SDL
# define PJMEDIA_VIDEO_DEV_HAS_SDL 0
# define PJMEDIA_VIDEO_DEV_HAS_QT 0
# define PJMEDIA_VIDEO_DEV_HAS_IOS 0
# define PJMEDIA_VIDEO_DEV_HAS_DSHOW 0
# define PJMEDIA_VIDEO_DEV_HAS_CBAR_SRC 0
# define PJMEDIA_VIDEO_DEV_HAS_FFMPEG 0
# undef PJMEDIA_VIDEO_DEV_HAS_V4L2
# define PJMEDIA_VIDEO_DEV_HAS_V4L2 0
#endif /* THIRD_PARTY_MEDIA */
PS: I just want audio support in my application, so PJMEDIA_HAS_VIDEO
is set to 0.
I use the following commands to compile pjsua2 with 3rd party media. (I am taking the cofigure command reference from pjsip-apps/src/3rdparty_media_sample/config_site.h)
CFLAGS="-g -Wno-unused-label" ./configure --enable-ext-sound --disable-speex-aec --disable-g711-codec --disable-l16-codec --disable-gsm-codec --disable-g722-codec --disable-g7221-codec --disable-speex-codec --disable-ilbc-codec --disable-opencore-amr --disable-sdl --disable-ffmpeg --disable-v4l2 --disable-libwebrtc --disable-video --disable-libyuv --disable-openh264 --enable-shared --prefix=<application_path>/dep_x86-64_pj2.10/
make dep
make lib
make install
The compilation of pjsua2 with command 'make lib' is successful, and the libraries are getting successfully included in my main project (Which is a Qt based project).
But when i build the project (in QtCreator), following undefined references errors pop-up:
<application_path>/dep_x86-64_pj2.10/lib//libpjsua2.so: undefined reference to `pjsua_conf_connect_param_default'
<application_path>/dep_x86-64_pj2.10/lib//libpjsua2.so: undefined reference to `pjsua_set_snd_dev2'
<application_path>/dep_x86-64_pj2.10/lib//libpjsua2.so: undefined reference to `pjsua_ext_snd_dev_get_conf_port'
<application_path>/dep_x86-64_pj2.10/lib//libpjsua2.so: undefined reference to `pjsua_snd_dev_param_default'
<application_path>/dep_x86-64_pj2.10/lib//libpjsua2.so: undefined reference to `pjsua_conf_connect2'
<application_path>/dep_x86-64_pj2.10/lib//libpjsua2.so: undefined reference to `pjsua_ext_snd_dev_create'
<application_path>/dep_x86-64_pj2.10/lib//libpjsua2.so: undefined reference to `pjsua_ext_snd_dev_destroy'
What I have found out:
If i don't include the modified config_site.h (with 3rd party media enabled), the compilation is successful (most probably as pjsua.so file contains references to these functions), and the application builds successfully with no errors. All calls are made properly, with pjmedia providing the audio.
When i looked at the undefined references, they were occuring in functions (in the file pjsip/src/pjsua2/media.cpp) which would be only used if the application didn't use 3rd party media (e.g. startTransmit2(), setCaptureDev(), setPlaybackDev() etc.). If I manually comment those function calls (to functions which are causing undefined references), I am able to build pjsua2 and my application successfully.
But this doesn't seem to be the right way to do things.
Can anyone tell me why these undefined references are coming while building my application. Or where am I going wrong in this? Any Help would be appreciated.