ContentsmacOS and iOS SimulatorWindowsGTKEFL macOS and iOS Simulator Install Xcode To build WebKit for macOS or iOS Simulator, Xcode is required. Get Xcode from the App Store or https://developer.apple.com/downloads. Install the Xcode Command Line Tools In Terminal, run the command: xcode-select --install For Xcode 26 and newer, install Metal toolchain In Terminal, run the command xcodebuild -down