Getting the source code to PJProject.
To get the latest source to PJProject, run the command below.
svn checkout http://svn.pjsip.org/repos/pjproject/trunk pjproject

I am currently using version 2.1 stable.

//To get the revision that I am using in VoiceMac and VoiceMob, run the command below.
//svn checkout -r 4293 http://svn.pjsip.org/repos/pjproject/trunk pjproject

Building.
To build for VoiceMac, run the command below.
./install

To build for VoiceMob, run the command below.
./install ios