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Oh whoops. It should be multi-platform according to Unity, so I'll have to figure out why it's not working.

I haven't used Unity myself but I think you need to export it separately for different platforms, or at least manually enable exporting to them somewhere. It should produce different binaries for all the platforms, for example the Linux executables will have an .x86 or .x86_64 file extension I think.

Thanks, got it working. Took a while because I made the mistake of updating to Unity 2018 in the process.