OnStepX is still really far away from being usable. Last time I tried it (a few months ago), it did not even compile. Howard made changes and it did compile, but did not work at all. Motors did not move.
That is on the S6, which is not the platform that Howard is using for development.
But as long as things are in flux, I would not bother with it.
Join the onstep-dev sub group and report what you find there. It is where Howard responds for OnStepX stuff.