Cargo Features

fitsio-sys has no features set by default.

[dependencies]
fitsio-sys = { version = "0.5.4", features = ["fitsio-src", "with-bindgen"] }
fitsio-src
with-bindgen = 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 with-bindgen?