Cargo Features

libcontract-sys has no features set by default.

[dependencies]
libcontract-sys = { version = "1.0.0", features = ["private"] }
private

To enable the use of Private (unstable) interfaces, use the "private"
feature:

Affects libcontract-sys::ct_event_t, libcontract-sys::ct_status_t, libcontract-sys::ct_param_t