Rust uses -sys crates to link to non-native dependencies, with a links key in the manifest - https://doc.rust-lang.org/cargo/reference/build-scripts.html#the-li

Rust uses -sys crates to link to non-native dependencies, with a links key in the manifest - https://doc.rust-lang.org/cargo/reference/build-scripts.html#the-links-manifest-key https://doc.rust-lang.org/cargo/reference/build-scripts.html... This mechanism allows Cargo to prevent multiply linking to an external library.