Cargo Features

Resolv-conf has no features set by default.

[dependencies]
resolv-conf = { version = "0.7.0", features = ["system"] }
system = hostname

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](https://rust-lang.github.io/rfcs/3491-remove-implicit-features.html).

hostname system?

Enables hostname ^0.3