Here is the top part of the code from a set up I have working.
Code:
'16F88
DEFINE OSC 8
OSCCON= %01110100

@__CONFIG _CONFIG1, _CP_OFF & _CCP1_RB3 & _DEBUG_OFF & _WRT_PROTECT_OFF & _CPD_OFF & _LVP_OFF & _BODEN_OFF & _MCLR_OFF & _PWRTE_OFF & _WDT_OFF &_INTRC_IO
This is using the internal OSC, but you should get the idea.

You can look in the PicBasic inc file and the inc file in MPASM Suite for all of the possibilities.