Cargo Features

log4rs-rolling-file has no features set by default.

[dependencies]
log4rs-rolling-file = { version = "0.2.0", features = ["gzip"] }
gzip = flate2

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.

flate2 gzip?

Enables flate2 ^0.2