Use pkg-config to find Libsodium (macOS and linux only).
homebrew
(off by default)
Use Homebrew version of Libsodium (macOS only).
libsodium-bindings
libsodium-bindings exposes a set of FFI bindings from the libsodium-1.0.18-stable library.
It has no other dependency than base, and the documentation is strong enough to stand alone.