Build without WebRTC

Hi,

Is it possible to build gecko and mozembedlite libraries with WebRTC and 
PulseAudio disabled? I'm following the instructions from 
https://wiki.mozilla.org/Embedding/IPCLiteAPI and I've added this to my 
mozconfig:
ac_add_options --enable-pulseaudio=no
ac_add_options --enable-webrtc=no

But still receive the following error during build (build.sh -t desktop):

4:28.63                  from 
/home/user/gecko-full/xulrunner-package/mozilla-central/media/webrtc/trunk/webrtc/modules/audio_device/linux/audio_device_pulse_linux.cc:15:
4:28.63 ../../../../../../dist/system_wrappers/pulse/pulseaudio.h:3:35: 
fatal error: pulse/pulseaudio.h: No such file or directory
4:28.63 compilation terminated.