Cargo Features

[dependencies]
lz4-java-wrc = { version = "0.2.0", default-features = false, features = ["use_lz4_flex", "use_lz4-sys"] }
default = use_lz4_flex

The use_lz4_flex feature is set by default whenever lz4-java-wrc is added without default-features = false somewhere in the dependency tree.

use_lz4_flex default = lz4_flex
use_lz4-sys = libc, lz4-sys

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.

lz4_flex use_lz4_flex
lz4-sys use_lz4-sys?
libc use_lz4-sys?