title: bundle install error for system_timer 1.2.4
body: <p>9.3 and every time i try "bundle install" it starts ok then give me this error...</p>
  
  <p>An error occurred while installing system_timer (1.2.4), and
  Bundler cannot continue.
  Make sure that <code>gem install system_timer -v '1.2.4'</code> succeeds
  before bundling.</p>
  
  <p>when i try to run system_timer it says...</p>
  
  <p>sudo gem install system_timer
  Building native extensions.  This could take a while...
  ERROR:  Error installing system_timer:
      ERROR: Failed to build gem native extension.</p>