I've made a few changes to the official source, viewable at https://github.com/feldenthorne/XNAPoS. I would highly suggest looking over my changes and compiling from these sources if you use plan on compiling yourself.
Overview of Changes:
- PoSV2 calculation fixed to use block height instead of block time
- PoSV1 calculation restored to clipped algorithm
- Fixed blockchain syncing from below 2500 blocks (you can now sync the full blockchain without a download)
- Bumped RPC protocol version because it was not bumped during the hard fork
Although I would suggest building your own binaries, if you can't figure out how to compile them for Linux yourself, you can give these a try: DeOxyRibose_qt_headless_2.3.1.0.7z.
A word of caution, however: using other people's binaries is highly inadviable! It's a lot safer to review the source yourself and build from code that you can review. If you do insist on using the above binaries, make sure to give them a virus scan!
Blockchain (12410, Windows/Linux/Mac):
If you need a copy of the blockchain for some reason (even though you should be able to sync the whole thing now, after the syncing patch), you can try this: xna_blockchain_12410.zip.
Great work feldenthorne