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I've been compiling minetest from source. Everything was working fine, but then jthread was updated from 1.2 to 1.3. Now minetest won't build at all; it gives me this error. :o I could just keep jthread at 1.2 but, well, i think minetest should work with the latest version.

Which operating system, compiler? As you seem to be using a system jthread, not the bundled one, where did you get jthread from? The error messages suggest two possibilities:

1. The linker doesn't find the jthread library. You might have to delete CMakeCache.txt in your build directory and run make again.
2. If the linker finds jthread, there might be some difference between the compiler jthread was compiled with and the one you're compiling minetest with.