title: why do i keep getting these errors after running "gem pristine --all"
body: <p>I try to run <code>gem pristine --all </code> and I keep getting this in the console.</p>
  <p>when I run <code>gem pristine --all</code> I get this:</p>
  <p><code>Permission denied</code>....</p>
  <p>I even tried to do <code>gem install</code> for every <code>gem</code> and still get this:</p>
  <pre><code>`Ignoring binding_of_caller-0.7.2 because its extensions are not built.  Try: gem pristine binding_of_caller --version 0.7.2
      Ignoring byebug-5.0.0 because its extensions are not built.  Try: gem pristine byebug --version 5.0.0
      Ignoring debug_inspector-0.0.2 because its extensions are not built.  Try: gem pristine debug_inspector --version 0.0.2
      Ignoring executable-hooks-1.3.2 because its extensions are not built.  Try: gem pristine executable-hooks --version 1.3.2
      Ignoring gem-wrappers-1.2.7 because its extensions are not built.  Try: gem pristine gem-wrappers --version 1.2.7
      Ignoring json-1.8.3 because its extensions are not built.  Try: gem pristine json --version 1.8.3
      Ignoring mysql-2.9.1 because its extensions are not built.  Try: gem pristine mysql --version 2.9.1
      Ignoring mysql2-0.3.18 because its extensions are not built.  Try: gem pristine mysql2 --version 0.3.18
      Ignoring nokogiri-1.6.6.2 because its extensions are not built.  Try: gem pristine nokogiri --version 1.6.6.2
      Ignoring pg-0.18.2 because its extensions are not built.  Try: gem pristine pg --version 0.18.2`
  </code></pre>