anchor.diff:  }
   
   final RegExp _xcodeVersionRegExp = new RegExp(r'Xcode (\d+)\..*');
  -final String _xcodeRequirement = 'Xcode 7.0 or greater is required to develop for iOS.';
  +final String _xcodeRequirement = 'Xcode $kXcodeRequiredVersionMajor.$kXcodeRequiredVersionMinor or greater is required to develop for iOS.';
   
   bool _checkXcodeVersion() {
     if (!platform.isMacOS)
  
positive.code:   try {
      final String version = runCheckedSync(<String>['xcodebuild', '-version']);
      final Match match = _xcodeVersionRegExp.firstMatch(version);
      if (int.parse(match[1]) < 7) {
        printError('Found "${match[0]}". $_xcodeRequirement');
        return false;
      }
  
negative.code: import 'ios_workflow.dart';
  import 'xcodeproj.dart';
  
  const int kXcodeRequiredVersionMajor = 8;
  const int kXcodeRequiredVersionMinor = 0;
  
  // The Python `six` module is a dependency for Xcode builds, and installed by
  