Cargo Features

SndFile has no features set by default.

[dependencies]
sndfile = { version = "0.1.1", features = ["ndarray_features"] }
ndarray_features = ndarray

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.

ndarray ndarray_features?

Enables ndarray ^0.13