rust-clippy/book/src/installation.md

Installation

If you're using rustup to install and manage your Rust toolchains, Clippy is usually already installed. In that case you can skip this chapter and go to the Usage chapter.

Note: If you used the minimal profile when installing a Rust toolchain, Clippy is not automatically installed.

Using Rustup

If Clippy was not installed for a toolchain, it can be installed with

$ rustup component add clippy [--toolchain=<name>]

From Source

Take a look at the Basics chapter in the Clippy developer guide to find step by step instructions on how to build and install Clippy from source.