[ЖЖ] Установка Qt4 for ruby на версии старше 1.8

$ ruby --version
ruby 1.9.1p431 (2011-02-18 revision 30908) [x86_64-linux]
$ irb
irb(main):001:0> require 'Qt4'
=> true
irb(main):002:0> qApp = Qt::Application.new ARGV
=> #<Qt::Application:0x00000000c86000 objectName="irb">
irb(main):003:0> w = Qt::Label.new 'Hello'
=> #<Qt::Label:0x00000000c68e80 objectName="", x=0, y=0, width=640, height=480>
irb(main):004:0> w.show
=> nil
irb(main):005:0> qApp.exec
=> true
irb(main):006:0> quit
$ cat /etc/slackware-version 
Slackware 13.37.0