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That was not the problem. I added execution rights (chmod +x) to all libraries inside /usr/share/textsuggest/libs/, now the server went further and says:

textsuggest-server: symbol lookup error: /lib/x86_64-linux-gnu/librt.so.1: undefined symbol: __clock_nanosleep, version GLIBC_PRIVATE

I suppose that my version of librt.so isn't appropriate for it.

I see. I think the fix is to bundle librt as well along with everything else. I'll try to get that done within next week. Thanks again for reporting!

Please check if this build works. If it does I'll upload to itch.
https://gofile.io/d/e92CA5