Cargo Features

[dependencies]
xray = { version = "0.1.1", default-features = false, features = ["opengl"] }
default = gl

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

opengl = gl

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

gl default opengl?

Enables gl ^0.10.0