ianh-macbookair:~ ianh$ xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
ianh-macbookair:~ ianh$ flutter doctor
[✓] Flutter (on Mac OS, channel master)
    • Flutter at /Users/ianh/dev/flutter
    • Framework revision 040a080541 (3 hours ago), 2016-10-13 11:13:31
    • Engine revision cf774d580c
    • Tools Dart version 1.20.0-dev.10.2

[✓] Android toolchain - develop for Android devices (Android SDK 24.0.3)
    • Android SDK at /Users/ianh/Library/Android/sdk
    • Platform android-24, build-tools 24.0.3
    • Java(TM) SE Runtime Environment (build 1.8.0_102-b14)

[-] iOS toolchain - develop for iOS devices
    x XCode not installed; this is necessary for iOS development.
      Download at https://developer.apple.com/xcode/download/.
    x ideviceinstaller not available; this is used to discover connected iOS devices.
      Install via 'brew install ideviceinstaller'.
    x ios-deploy not available; this is used to deploy to connected iOS devices.
      Install via 'brew install ios-deploy'.

[x] Flutter IDE Support (No supported IDEs installed)
    • Atom - https://atom.io/
    • IntelliJ - https://www.jetbrains.com/idea/

[✓] Connected devices
    • None
ianh-macbookair:~ ianh$