$ rails s --debugger /home/is0me/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `require': /home/is0me/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so: undefined symbol: ruby_threadptr_data_type - /home/is0me/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so (LoadError) 2012年8月22日時点で、ruby-debug19がまだ1.9.3-p194
![ruby-debug19のインストールに失敗する - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/7cfc991d9a7961be8ff55795d2db691935705b37/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9cnVieS1kZWJ1ZzE5JUUzJTgxJUFFJUUzJTgyJUE0JUUzJTgzJUIzJUUzJTgyJUI5JUUzJTgzJTg4JUUzJTgzJUJDJUUzJTgzJUFCJUUzJTgxJUFCJUU1JUE0JUIxJUU2JTk1JTk3JUUzJTgxJTk5JUUzJTgyJThCJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmdHh0LWNsaXA9ZWxsaXBzaXMmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz03MzJlMjI1NjQwYTFiODFkMDY4YzdlNmU4YjU3N2FkOQ%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwaXMwbWUmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT0zNiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPWI5YmIzZWU0ZGY2MDExYmUyYWJkZjNiZjEzNGZlZWQ2%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D4dba70b3c52733bf82ed0d826025540a)