The link to "rust-bindgen" in page https://anssi-fr.github.io/rust-guide/07_ffi.html seems to be broken. I think it probably refers to "bindgen" (https://crates.io/crates/bindgen).
EDIT: the broken link is introduced when replacing Github link to Crates.io link: https://github.com/ANSSI-FR/rust-guide/commit/49822911e4f14b...