I did the Linux port of this game on Steam. here's what I used. https://github.com/coelckers/ZMusic/releases/tag/1.1.3
https://github.com/coelckers/gzdoom/releases/tag/g4.6.0
The source code for the Windows executable can be downloaded here:
https://github.com/coelckers/gzdoom/releases/tag/g4.3.3
This game does not use a patched or modified version of gzdoom for either Linux or Windows so this source code is identical to the code used to create the binaries.
hope this helps lmao.