Cargo Features

haversine-redux has no features set by default.

[dependencies]
haversine-redux = { version = "0.2.1", features = ["no_std"] }
no_std = libm

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.

libm no_std?