Could not find any source code. Closed-source engine?

In any case, hopefully its build system/binaries are 'correct' for their elf/linux export:

1 - "-static-libgcc" and "-static-libstdc++" (if c++) by default.

2 - proper glibc ABI selection (see binutils ld documentation, the 2nd part of the "VERSION" documention). This is the annoying part, and it must include glibc internal symbols (REALLY annoying but MANDATORY for closed-source binaries on elf/linux). You can mitigate with "build containers" including "old glibc" for linking, hence selecting an old glibc ABI (or your binaries won't load, very probably, on any elf/linux system with a glibc older than the one used for linking).

3 - proper libdl-ing of all video game core system interface shared lib: (wayland code is statically link), vulkan, legacy x11, legacy GL, libxkbcommon(-x11) (if the engine does handle keyboard inputs), with proper fall-back code paths.