Zandronum

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I had this issue and I resolved it by:

1. Open a terminal.
2. type sudo rm /usr/local/lib/libsdl* and hit enter.

Or go to /usr/local/lib and manually remove libsdl files.

Then try running Zandronum again. I am currently compiling Zandronum with the patch mentioned here: https://zandronum.com/tracker/view.php?id=3848

I don't know if this would solve your original issue, though.