title: Error installing debugger-linecache in Ruby 1.9.3
body: <p>I need version 1.0.1 of <code>debugger-linecache</code> for a project, and I am facing the following error when trying to install.</p>
  
  <pre><code>trunk ☺  gem install debugger-linecache -v '1.0.1'
  Building native extensions.  This could take a while...
  ERROR:  Error installing debugger-linecache:
      ERROR: Failed to build gem native extension.
  
          /Users/jordanscales/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
  checking for vm_core.h... no
  checking for vm_core.h... no
  Makefile creation failed
  **************************************************************************
  No source for ruby-1.9.3-p194 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.
  
  Provided configuration options:
      --with-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/jordanscales/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
      --with-ruby-dir
      --without-ruby-dir
      --with-ruby-include
      --without-ruby-include=${ruby-dir}/include
      --with-ruby-lib
      --without-ruby-lib=${ruby-dir}/lib
  
  
  Gem files will remain installed in /Users/jordanscales/.rvm/gems/ruby-1.9.3-p194/gems/debugger-linecache-1.0.1 for inspection.
  Results logged to /Users/jordanscales/.rvm/gems/ruby-1.9.3-p194/gems/debugger-linecache-1.0.1/ext/trace_nums/gem_make.out
  trunk ☺  
  </code></pre>
  
  <p>Any help would be extremely appreciated, I have been searching but cannot find a working solution.</p>