I just tried to compile the latest Asterisk 13.8.0 and it stopped with several errors on pjsip. So FYI if you run the install_prereq script and then use ./configure –with-pjproject-bundled you will have the same problem because the prereq script installs an older version of pjproject. Make sure to uninstall pjproject-2.3-6.el7.x86_64 and pjproject-devel-2.3-6.el7.x86_64 before compiling asterisk. They really should remove this from the script but I guess they will do so in 15.
Telecomunicaciones Abiertas de México S.A. de C.V. Carlos Chávez