title: How to correctly uninstall Ruby 1.9.1
body: <p>Hi:) I have manually set Ruby 1.9.1. I have installed it via</p>
  
  <pre><code>./configure --prefix=/opt
  make
  make install
  </code></pre>
  
  <p>The target 'uninstall' does not exist in generated Makefile ...<br>
  How to do uninstallation <strong>correctly?</strong></p>
  
  <p>PS: I also believe that it is necessary to remove all the gems.<br>
  For this I use</p>
  
  <pre><code>#!/bin/sh
  gem list --local | grep [^\*] | cut -d ' ' -f 1 | xargs gem uninstall
  </code></pre>