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You can generate bindings using a gcc -c -fdump-ada-spec <header.h>. They typically work well enough without needing additional tweaks but If it's more involved you can ask Claude to make a shell script that generates bindings for whatever C library you wanted to use and it works reasonably well.

In my opinion, don't make thick bindings for your C libraries. It just makes it harder to use them.

For example I don't really like the OpenGL thick bindings for Ada because using them is so wildly different than the C examples that I can't really figure out how to do what I want to do.