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    <p>UPDATE: </p> <p>Looks like you only need to put this in your gemfile: </p> <p>gem "debugger"</p> <p>and now works. </p> <p>Old article follows</p> <p>====================================</p> <p>Jerome is correct, but lacking in the details. Here is the blow by blow, taken from this <a href="https://gist.github.com/1331533">https://gist.github.com/1331533</a>, in particular thanks to andrewroth's post. I've tested this as of the time of this post. One hopes that the changes will be deployed somewhere standard soon.</p> <pre><code>Installing ruby debugger on ruby 1.9.3-p125: export PATCH_LEVEL=`ruby -e 'puts RUBY_PATCHLEVEL'` export RVM_SRC=$HOME/.rvm/rubies/ruby-1.9.3-p$PATCH_LEVEL/include/ruby-1.9.1 gem install archive-tar-minitar gem install ruby_core_source -- --with-ruby-include=/$RVM_SRC export RVM_SRC=$HOME/.rvm/rubies/ruby-1.9.3-p$PATCH_LEVEL/include/ruby-1.9.1/ruby-1.9.3-p$PATCH_LEVEL wget http://rubyforge.org/frs/download.php/75415/ruby-debug-base19-0.11.26.gem wget http://rubyforge.org/frs/download.php/63094/ruby-debug19-0.11.6.gem wget http://rubyforge.org/frs/download.php/75414/linecache19-0.5.13.gem gem install linecache19-0.5.13.gem -- --with-ruby-include=/$RVM_SRC # if that step failed, and you are running OSX Lion, then following this post can help you: # http://stackoverflow.com/questions/8032824/cant-install-ruby-under-lion-with-rvm-gcc-issues # this happens if you recently installed xcode from the app store. # bizarrely, for me I had to do this: ln -s /usr/bin/gcc /usr/bin/gcc-4.2 gem install ruby-debug-base19-0.11.26.gem -- --with-ruby-include=/$RVM_SRC Then edit Gemfile: gem 'linecache19', '0.5.13', :path =&gt; "~/.rvm/gems/ruby-1.9.3-p#{RUBY_PATCHLEVEL}/gems/linecache19-0.5.13/" gem 'ruby-debug-base19', '0.11.26', :path =&gt; "~/.rvm/gems/ruby-1.9.3-p#{RUBY_PATCHLEVEL}/gems/ruby-debug-base19-0.11.26/" gem 'ruby-debug19', :require =&gt; 'ruby-debug' Then install: bundle install </code></pre>
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    2. COI did everything in Rob's post, but the gem installs failed. I had to do the following in the directory where the gem was downloaded: rvm 1.9.3-p0@mygemset do gem install ~/Downloads/linecache19-0.5.13.gem -- --with-ruby-include=/Users/<your_user_name>/.rvm/src/ruby-1.9.3-p0 rvm 1.9.3-p0@mygemset do gem install ~/Downloads/ruby-debug-base19-0.11.26.gem -- --with-ruby-include=/Users/<your_user_name>/.rvm/src/ruby-1.9.3-p0 I'm running OSX Lion 10.7.3
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    3. COI did everything in Rob's post, but the gem installs failed. I had to do the following in the directory where the gem was downloaded: rvm 1.9.3-p0@mygemset do gem install ~/Downloads/linecache19-0.5.13.gem -- --with-ruby-include=/Users/<your_user_name>/.rvm/src/ruby-1.9.3-p0 rvm 1.9.3-p0@mygemset do gem install ~/Downloads/ruby-debug-base19-0.11.26.gem -- --with-ruby-include=/Users/<your_user_name>/.rvm/src/ruby-1.9.3-p0 I'm running OSX Lion 10.7.3
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