Unclear install error for ruby 2

[btakita]

There should be a clear error message that states debugger is not compatible with Ruby 2.

I received the following error when attempting an install:

$ gem install debugger
Fetching: columnize-0.9.0.gem (100%)
Successfully installed columnize-0.9.0
Fetching: debugger-ruby_core_source-1.3.7.gem (100%)
Successfully installed debugger-ruby_core_source-1.3.7
Fetching: debugger-linecache-1.2.0.gem (100%)
Successfully installed debugger-linecache-1.2.0
Fetching: debugger-1.6.8.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing debugger:
    ERROR: Failed to build gem native extension.

    /home/phoenix/.rbenv/versions/2.2.0/bin/ruby -r ./siteconf20150119-8346-1n464ri.rb 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=/home/phoenix/.rbenv/versions/2.2.0/bin/$(RUBY_BASE_NAME)
/home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:1391:in `initialize': No such file or directory @ rb_sysopen - ./220/ruby_debug.h (Errno::ENOENT)
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:1391:in `open'
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:1391:in `copy_file'
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:485:in `copy_file'
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:402:in `block in cp'
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:1570:in `block in fu_each_src_dest'
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:1584:in `fu_each_src_dest0'
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:1568:in `fu_each_src_dest'
    from /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/2.2.0/fileutils.rb:401:in `cp'
    from extconf.rb:83:in `block in <main>'
    from extconf.rb:82:in `each'
    from extconf.rb:82:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/debugger-1.6.8 for inspection.
Results logged to /home/phoenix/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/extensions/x86_64-linux/2.2.0-static/debugger-1.6.8/gem_make.out

[cldwalker]

Thanks for reporting your issue! This is one of my 14 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]

A note at the top of the readme already exists. Happy to take a pull for this.

[quantumpotato]

+1. Where do I find mkf.log to see errors?

[sungwoncho]

+1

[lumir]

+1

[hellobanny]

+1