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Quick update on the Linux version: It looks like we don't have direct control over if Steam uses the Proton version or the native version. Right now it's still defaulting to Proton. We've reached out to Steam to ask them about it.
For now a workaround is to set Steam Play to use the Steam Linux Runtime until Valve sort out the whitelist issue with it.
Please email us w/ screenshots and it's something we can look into. I'm not aware of this specific problem. Contact info here: http://subsetgames.com/contact.html
libGL: MESA-LOADER: failed to open /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so: /usr/lib/x86_64-linux-gnu/libLLVM-9.so.1: undefined symbol: _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev, version GLIBCXX_3.4.21
Using the opensource Mesa driver on Ubuntu 20.04.
You are distributing your own libstdc++ and libSDL. I don't think there's any reason to do that and it's not Steam Linux best practice... ? It's better to just let the dynamic linker pick up the one from the steam runtime, will be more future proof and should really just be less work for you... ?
I can workaround it by copying in my local libstdc++ in your library folder:
cp /usr/lib/x86_64-linux-gnu/libstdc++.so.6 ...../linux_x64/
From https://github.com/ValveSoftware/steam-runtime/blob/master/doc/goals.md
Games that inappropriately bundle libraries work anyway
Some games bundle private copies of libraries that also exist in the Steam Runtime, or libraries that are dependencies of graphics drivers, or even the graphics drivers themselves. These libraries bypass the mechanisms that are intended to make sure games keep working.
For example, some games bundle a private copy of libgcc_s.so.1 or libstdc++.so.6, and Mesa graphics drivers also depend on those libraries. If the game's bundled copy is older than the version that the user's Mesa graphics driver requires, the game will crash or otherwise fail to work.