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I suspect that when providing libsndio.so.6.1, it may requires other .so files.

libsndio.so.6.1 is available in AdditionalFilesForLinuxAntix.zip of my game B-14 Bird Fortress. The zip archive also contains other .so files required for Linux antiX 23

Could help me with the following:

1) copy libsndio.so.6.1 into Red Balloon of Happiness folder

2) run ./Jim.sh

3) repeat step 1) and 2) for other missing .so files

4) Send me the list of .so files you need for Linux Mint 22.3 so I can add them all to the game.

Upgrading my games from SDL2 to SDL3 was on low priority, but the benefit you pointed makes me rethink priorities.