anchor.diff:    UnpackCommand() {
       argParser.addOption(
         'target-platform',
  -      allowed: <String>['windows-x64'],
  +      allowed: <String>['windows-x64', 'linux-x64'],
       );
       argParser.addOption('cache-dir',
           help: 'Location to output platform specific artifacts.');
  
positive.code:     'icudtl.dat',
      'cpp_client_wrapper/',
    ],
  };
  
  /// Copies desktop artifacts to local cache directories.
  
negative.code:     switch (platform) {
        case TargetPlatform.windows_x64:
          cacheStamp = 'windows-sdk';
          break;
        case TargetPlatform.linux_x64:
          cacheStamp = 'linux-sdk';
          break;
        default:
          throwToolExit('Unsupported target platform: $platform');
  