Cargo Features

[dependencies]
libblas-sys = { version = "0.1.0", default-features = false, features = ["netlib", "openblas"] }
default = openblas

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

netlib = netlib-provider
openblas default = openblas-provider

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.

netlib-provider netlib?
openblas-provider openblas