What C++ or C Libraries Do You Wish Were In The Rust Ecosystem

The Rust ecosystem seems pretty complete overall. Still, I recently ran into an instance where there weren't any good TTS (text to speech) libraries in Rust. I am currently finishing porting/binding a C++ one over to Rust. It's been challenging but a good learning experience. That said, are there any libraries you wish had a Rust implementation or a least a Rust binding? I might make a hobby out of porting some, as I think doing is the best way to learn.