It seems that gentoo uses a fully outdated way to provide 32 bit libs. Debian/Ubuntu can usually just install the libname:i386 package. A prebuild lib can sometimes miss some features or just crash, but sdl can be easyly build if needed. Basically for Steam games with Radeon OSS drivers you really have to delete some files like:
Btw. Ubuntu uses another path but that should be simple to exchange. This is a generic way to force the use of system-wide installed libs. Be aware that steam client updates add the files again.
Code:
find ~/.local/share/Steam/ubuntu12_32 \( -name libstdc++.so.6 -o -name libgcc_s.so.1 \) -exec rm -vf {} \;
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