I've had access to a lot of natural pine over the last few years, and at times burned it in our combustion heater almost exclusively. I visually checked my flue before the winter season this year out of curiousity, and there was zero build up anywhere in the chimney.
I'm can only assume that so long as the pine is well seasoned and you get your fire well lit before turning it down (such that it doesn't smoulder and smoke), you shouldn't have any issue with build up in your flue.