Flutter build IOS on root of my flutter app does not work

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Whenever I run this command from terminal: flutter build ios in the root of the project for my flutter app, I get back:


Cannot find "xcodebuild". Xcode 9.0 or greater is required to develop for iOS.


Encountered error while building for device.
I have the lastest Xcode (Version 10.0).

Flutter doctor:

[✓] Flutter (Channel beta, v0.8.2, on Mac OS X 10.13.6 17G65, locale en-GB)
• Flutter version 0.8.2 at /Users/h/flutter
• Framework revision 5ab9e70727 (2 weeks ago), 2018-09-07 12:33:05 -0700
• Engine revision 58a1894a1c
• Dart version 2.1.0-dev.3.1.flutter-760a9690c2

[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
• Android SDK at /Users/h/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-27, build-tools 27.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
• All Android licenses accepted.

[!] iOS toolchain - develop for iOS devices
✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
Download at: https://developer.apple.com/xcode/download/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
• ios-deploy 1.9.2
• CocoaPods version 1.5.3

[✓] Android Studio (version 3.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 24.2.1
• Dart plugin version 173.4700
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[✓] Connected devices (1 available)
• h iPhone • 77afb908fc6c490d3fca62cdde9a74ab4e45b4f0 • ios • iOS 11.4.1

! Doctor found issues in 1 category.


I assume the IOS issue is thrown as I am running Xcode from an external HD

The suggestion from flutter doctor -v is quite clear

✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
Download at: https://developer.apple.com/xcode/download/
Or install Xcode via the App Store.
Once installed, run:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Develope


You could try starting Xcode and agree when it asks to install missing components.

Id suggest you try the dev or master channel where support for Xcode 10 should have landed. Otherwise check this suggestion https://github.com/flutter/flutter/issues/20685#issuecomment-413524718

Issue fixed, by switching to dev channel, and moving Xcode from external HD to internal, command executed successfully.

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