Feel free to check out https://github.com/olvwm/xview/ as well.

I wanted to run olvwm on Linux (when it went out of support on Ubuntu 16.04) and I'd managed to get this running on Ubuntu 20.04 (and more recently on Gentoo, as documented at https://ces.mataroa.blog/blog/gentoo-olvwm-bye-ubuntu/).

A survey of available olwvm implementations available on github at the time I created the repo is in the README of https://github.com/olvwm/xview/

Currently this works on an ancient 32-bit laptop (running NixOS 22.05 as documented in https://ces.mataroa.blog/blog/distro_hoppingmd/) as well.