Cargo Features

[dependencies]
sp1-core-machine = { version = "4.0.1", default-features = false, features = ["debug", "bigint-rug", "sys"] }
default = sys

The sys feature is set by default whenever sp1-core-machine is added without default-features = false somewhere in the dependency tree.

debug
bigint-rug

Enables bigint-rug of sp1-curves

sys default

Affects sp1-core-machine::sys