ruby 2.0 crashes on "require 'tk'"

[meschi]

Linux Mint 17 Xfce 32 bit

The problem is triggered easily:
I have installed the package 'libtcltk-ruby'
When requiring tk in ruby 1.9 there is no problem.
but in ruby 2.0 the require statement fails:
$ irb2.0
irb(main):001:0> require 'tk'
LoadError: cannot load such file -- tk
 from /usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:53:in `require'
 from /usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:53:in `require'
 from (irb):1
 from /usr/bin/irb2.0:12:in `<main>'

Instead, it obviously should have just inported tk.
The happens everytime.

http://stackoverflow.com/questions/20874900/ruby-require-tk-yields-loaderror-no-such-file-to-load-tk
https://bugs.ruby-lang.org/issues/8435

Since this is considered to be a 3rd party problem, it would be nice if someone fixed this.