Cargo Features

[dependencies]
libxen-sys = { version = "0.2.0", default-features = false, features = ["xenevtchn", "vm_event", "bindings-4_20"] }
default = bindings-4_20, vm_event, xencontrol, xendevicemodel, xenevtchn, xenforeignmemory, xenstore

These default features are set whenever libxen-sys is added without default-features = false somewhere in the dependency tree.

xencontrol xendevicemodel xenevtchn default
xenforeignmemory xenstore vm_event default
bindings-4_20 default

libxen-sys has 4 features without comments.