I'm trying to set up the five-men syzygy tablebases for use in xboard 4.8. Stockfish 6 and Komodo 9 are both supposed to support Syzygy, but in Xboard, their SyzygyPath option is missing from the UCI options.
I've tried setting up the tablebase through the GUI options but there's no documentation on how to do this with Syzygy rather than Nalimov that I can find. Anyone have a clue how this is done?