import javax.swing.plaf.synth.SynthLookAndFeel;

svoid useSynthLAF(File zipFile) {
  new SynthLookAndFeel lookAndFeel;

  pcall {
    URL url = new URL("jar:file:" + f2s(zipFile));
    print(url);
    lookAndFeel.load(url);
    UIManager.setLookAndFeel(lookAndFeel);
  }
}