/usr/lib/ruby/1.8/Qt3.rb is in ruby-qt4 4:4.8.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | begin
version = Qt::version
raise LoadError.new("Qt4 already loaded") unless version =~ /^3/
rescue NameError
require 'qtruby'
end
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