Apple’s Command Line

macOS opens a system dialog that downloads and installs Apple’s Command Line Tools (CLT), including clang, git, make, and SDK headers, through Software Update

% xcode-select --install

% clang --version
Apple clang version 21.0.0 (clang-2100.3.34.2)
Target: arm64-apple-darwin27.0.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin


What xcode-select --install Does

Triggers macOS’s built‑in installer for Command Line Tools for Xcode

Downloads a ~hundreds‑MB package containing
clang, git, make
macOS SDK headers
Toolchain binaries
Installs to: /Library/Developer/CommandLineTools

How to Install
Method 1 — Direct Terminal Command
% xcode-select --install

A dialog appears → click Install → agree to the license → installation completes.

Method 2 — Auto‑Prompt
Running tools like git, clang, or gcc on a fresh macOS system automatically triggers the same installation dialog


Method 3 — Apple Developer Website
Visit the Apple Developer “More Downloads” page
Sign in → search Command Line Tools for Xcode → download .dmg → install
Verify Installation
% xcode-select -p
Expected output:
/Library/Developer/CommandLineTools

Check package info:
% pkgutil --pkg-info=com.apple.pkg.CLTools_Executables
Shows version and install location.

package-id: com.apple.pkg.CLTools_Executables
version: 27.0.0.0.1788430756
volume: /
location: /
install-time: 1790798991


Fix Common Error: “invalid active developer path”
Occurs after macOS updates.
Fix by reinstalling:
% xcode-select --install
% sudo xcode-select --reset

Summary
% xcode-select --install
is the standard and simplest way to install Apple’s Command Line Tools,
providing essential compilers and utilities without requiring the full Xcode IDE