Can't install fast debugger at Netbeans 6.9.1 for ruby 2.2.3p173

Question

I'm trying to debug rails project (redmine) at Netbeans 6.9.1

When I click debug project I get the message:

When I click Install Fast Debugger I get the following error:

Building native extensions.  This could take a while...
ERROR:  Error installing ruby-debug-ide:
    ERROR: Failed to build gem native extension.

    /home/anatoly/.rvm/rubies/ruby-2.2.3/bin/ruby mkrf_conf.rb
Building native extensions.  This could take a while...

rake failed, exit code 1

Gem files will remain installed in /home/anatoly/.rvm/gems/ruby-2.2.3/gems/ruby-debug-ide-0.4.9 for inspection.
Results logged to /home/anatoly/.rvm/gems/ruby-2.2.3/extensions/x86_64-linux/2.2.0/ruby-debug-ide-0.4.9/gem_make.out

gem_make.out not very informative and helpful for, at least for me:

/home/anatoly/.rvm/rubies/ruby-2.2.3/bin/ruby mkrf_conf.rb
Building native extensions.  This could take a while...

rake failed, exit code 1

I'm using Ubuntu 14.04.1 with ruby 2.2.3p173 and rails 4.2.4

What may I doing wrong?

Answer 1

I have installed manually ruby-debug-ide -v 0.4.33 gem and problem has been solved

gem install ruby-debug-ide -v 0.4.33

Answer 2

gem install ruby-debug-ide will auto install ruby-debug-ide version 0.6, but netbeans 6.9.1 needs version 0.4.3.

gem install ruby-debug-ide -v 0.4.33 should be successful.