Unable to install since MRI 2.0.0-p576 because of debugger-ruby_core_source

[Zelnox]

On OSX 10.10, I get when trying to install the gem with MRI 2.0.0-p576

Makefile creation failed
**************************************************************************
No source for ruby-2.0.0-p594 provided with debugger-ruby_core_source gem.
**************************************************************************
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Also looks like debugger-ruby-core_source doesn’t support ruby >= 2.0 and to instructs to use byebug instead.
https://github.com/cldwalker/debugger-ruby_core_source/tree/master/lib/debugger/ruby_core_source