PBP include files do NOT include every single config option. They're normally only going to include just enough to help you get the PIC up & running.

It's up to you to read the data sheet, and config options you want to change if the default header file doesn't configure everything you want to change from the default.

For a complete list of all config options, don't look in the PBP .INC file. Look in the P18F24J50.INC file in your MPASM Suite directory. This has a list of every single config option the PIC type has, and explains what each option does.

In the microchip include file for this PIC type you'll see;

; RTCC Clock Select:
; RTCOSC = INTOSCREF RTCC uses INTRC
; RTCOSC = T1OSCREF RTCC uses T1OSC/T1CKI

Now look in the PIC data sheet config section for what each of these options are. I do not recommend you use the internal osc for RTC if you want a precise clock.