Cargo Features

[dependencies]
libxen-sys = { version = "0.1.1", default-features = false, features = ["xenevtchn", "vm_event"] }
default = 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

libxen-sys has 3 features without comments.