title: boost-1.55.0 undefined reference to `boost::thread::join() even after linking with the correct library
body: <p>I get undefined symbol reference errors even after linking with the correct boost library:</p>
  
  <pre><code>undefined reference to `boost::thread::join()
  undefined reference to `boost::thread::start_thread()
  </code></pre>
  
  <p><code>nm libboost_thread.so -Cg|grep boost::thread::join</code> shows</p>
  
  <pre><code>000000000000ce00 T boost::thread::join_noexcept()
  000000000000c1a0 T boost::thread::joinable() const
  </code></pre>
  
  <p>What happened to join() ? </p>