Cargo Features

fpng-rs has no features set by default.

[dependencies]
fpng-rs = { version = "1.0.9", features = ["internal-bindgen-on-build"] }
internal-bindgen-on-build = 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 internal-bindgen-on-build?

Enables bindgen ^0.60.1