GtkLookAndFeel

[William Ballard <nospam_40811@alltel.net>]

I have 1.4.2 Blackdown debs installed:
$ apt-cache show j2re1.4 j2sdk1.4 | grep-dctrl -sVersion .
Version: 1.4.2.01-1
Version: 1.4.2.01-1

I want to use GtkLookAndFeel.  But it is not available:

This code:
import javax.swing.UIManager;
class Foo {
  public static void main(String args[]) {
    UIManager.LookAndFeelInfo[] info = 
      UIManager.getInstalledLookAndFeels();
    for(int i = 0; i < info.length; i++) {
      System.out.println(info[i].getClassName());
      System.out.println(info[i].getName());
}}}
outputs this output:
javax.swing.plaf.metal.MetalLookAndFeel
Metal
com.sun.java.swing.plaf.motif.MotifLookAndFeel
CDE/Motif
com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Windows

However /usr/lib/j2se/1.4/jre/lib/rt.jar contains all the
com.sun.java.swing.plaf.gtk.GTKLookAndFeel.* files.

How can I use GtkLookAndFeel?