#137 Impossible to use native gtk look on linux

[Yanpas]

Logisim under Linux doesn't use native gtk theme style
export _JAVA_OPTIONS="-Dawt.useSystemAAFontSettings=on -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel

and editing /usr/lib/jvm/java-7-openjdk/jre/lib/swing.properties didn't help.
Why does logisim support native look on windows, but do not support on linux? Or I do something wrong?