Cargo Features

signal-backup-decode has no features set by default.

[dependencies]
signal-backup-decode = { version = "0.2.3", features = ["rebuild-protobuf"] }
rebuild-protobuf = protoc-rust

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.

protoc-rust build rebuild-protobuf?