Ok, can confirm that on Ubuntu 24.04.2 it builds (with a handful of deprecation warnings) and runs ok. I didn't do more than a smoke-test on running it though.
The README says:
On 2021-02-27 a successful build for Linux can be done with these steps:
[... (omitted the actual steps) ...]
And if successful, you should have an executable called "Milton" that runs.
I did not make this work automatically with CMake, because I don't know CMake.
(I have time to kill at an airport later so I might try it)