Here is a plugin I wrote that will compile openvm tools for you as the kernel version changes between unraid version. I've been using it since version Unraid 6.2 and has been working well for me.
It will compile it, package it and store it on your flash. The package will then be installed during reboots without the need to recompile. It will only recompile if it detects a new kernel version.
I don't plan on maintaining it outside of my personal use, so anyone who wants to run with this, feel free.
openVMTools_auto62.plg