Discovered I had forgotten to uncomment the follwoing statements required for using DT_INTS.

INCLUDE "DT_INTS-14.bas" ' Base Interrupt System
INCLUDE "ReEnterPBP.bas" ' Include if using PBP high priority interrupts

However, after fixing that however, I still have the following assembly errors I can't figure out:
Error[101] C:\PBP26\ELLIS_CODES\RTC\16F886\0SETDS1337CLOCK.AS M 790 : ERROR: ("INT_Handler" - Interrupt Flag ( INTCON,IOCIF ) not found.)
Error[101] C:\PBP26\ELLIS_CODES\RTC\16F886\0SETDS1337CLOCK.AS M 790 : ERROR: ("INT_ENABLE" - Interrupt Flag ( INTCON,IOCIF ) not found.)