Unable to install debugger 1.6.1 on 1.8.7

[mochnatiy]

Hello!
I use rvm 1.19.1, ruby 1.8.7 on OS X 10.8.4.
Dependencies: debugger-linecache and debugger-ruby_core_source already installed
But i cannot install debugger 1.6.1
Error message:

Building native extensions. This could take a while...
ERROR: Error installing debugger:
ERROR: Failed to build gem native extension.

    /Users/me/.rvm/rubies/ruby-1.8.7-p371/bin/ruby extconf.rb

*** 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.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/sergey/.rvm/rubies/ruby-1.8.7-p371/bin/ruby
extconf.rb:16:in `require': no such file to load -- debugger/ruby_core_source (LoadError)
from extconf.rb:16

[cldwalker]

Thanks for reporting your issue! This is one of my 9 active issues. Use that link to check how soon your issue will be answered. Don't forget to check your issue against this project's CONTRIBUTING.md. Cheers.

[cldwalker]

debugger is 1.9 and eventually 2.0 compatible as stated in the readme - https://github.com/cldwalker/debugger#description

Try ruby-debug which should be 1.8 compatible

[abepetrillo]

Managed to reproduce this on 1.9.3-p484, works when using gem install debugger -v 1.6.1, but using rbenv exec bundle install brakes it.