Cargo Features

[dependencies]
challenge_response = { version = "0.5.28", default-features = false, features = ["rusb", "nusb"] }
default = rusb

The rusb feature is set by default whenever challenge_response is added without default-features = false somewhere in the dependency tree.

rusb default

Enables rusb

Affects usb::BackendType, usb::rusb

nusb

Enables nusb

Affects usb::BackendType, usb::nusb