PICBasic does not have a P16F84.INC file. That file is for use with MPLAB and is located in MPLAB's MCHIP_Tools directory.

The corresponding PICBasic file is M16F8X.INC and is located in PICBasic's \INC sub-directory. You should find it there.

It's a Copyrighted file and part of PICBasic's distribution files and posting it would not be proper. If you've lost, deleted or corrupted this file, relload it from your master disk. If you don't have that disk, then best to get in contact with MeLabs.