Having trouble running WindowMaker in Trisquel Mini

I'd really like to try WindowMaker. I'm running Trisquel Mini 6.0. I've installed package wmaker, and I can manage to run it using xinit. However, if I try to launch it from LXDM, it fails and drops back to LXDM. I've tried this both on my regular install and from a live USB.

I'm not sure where to look to find out why it's failing, or where to start trying to fix it. Anyone have any ideas?