Cargo Features

frida-sys has no features set by default.

[dependencies]
frida-sys = { version = "0.15.1", features = ["auto-download"] }
auto-download = frida-build

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.

frida-build build auto-download?