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  start_url 'https://www.python.org/downloads/macos/';
  # Using universal2 installer.
  plugin Download => (
    filter  => qr/python-([0-9\.]+)-macos11.pkg/,
    version => qr/([0-9\.]+)/,
  );
  extract sub {
    my ($build) = @_;

    Alien::Build::CommandSequence->new([
      qw(pkgutil --expand-full),
      $build->install_prop->{download},
      'python'
    ])->execute($build);
  };

  patch sub {
    my ($build) = @_;

    my @children = Path::Tiny->cwd->children;
    $_->remove_tree for grep { $_->basename ne 'Python_Framework.pkg' } @children;