Cargo Features

steamworks-sys has no features set by default.

steamworks-sys = { version = "0.11.0", features = ["rebuild-bindings"] }
rebuild-bindings = bindgen

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

bindgen build rebuild-bindings?