Any idea how this happens?
$sudo gem install ruby-debug-ide19
Building native extensions. This could take a while...
ERROR: Error installing ruby-debug-ide19:
ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb
*** extconf.rb failed ***
<snip>
extconf.rb:2:in `require': no such file to load -- ruby_core_source (LoadError)
from extconf.rb:2
$ sudo gem list
*** LOCAL GEMS ***
<snip>
ruby_core_source (0.1.4)
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