title: Getting Chrono C++ library (Boost::sandbox) to work
body: <p>i wanted to try out <a href="https://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction#Boost.Chrono" rel="nofollow">Chrono</a> from the Boost sandbox. It seems to support a lot of stuff and should be stable.</p>
  
  <p>I have Boost in version 1.44 installed on my system (incl. boost_system lib which is needed) and took the sandbox version (the download-version is older and misses for example the ratio.hpp file).</p>
  
  <p>But it isn't compiling. Trying to compile the simple example from the documentation, with linking boost_system (in scons with LIBS=['boost_system']), the following error is occurring every time:</p>
  
  <pre><code>obj/main.o: In function `main':
  /home/***/src/main.cpp:34: undefined reference to `boost::chrono::system_clock::now()'
  scons: building terminated because of errors.
  </code></pre>
  
  <p>That seems to be a linker error. What did i do wrong? I have boost_system in version 1.44 linked (trough scons) and already tried the same with the older version 1.40.</p>
  
  <p>Any tips? How did you setup your use of chrono?</p>
  
  <p>Thanks.</p>
  
  <p>sascha</p>
  
  <p><strong>Edit:</strong> <a href="http://lists.boost.org/Archives/boost/2010/08/169593.php" rel="nofollow">This thread</a>, which is talking about compatibility issues, let me think that the sandbox version of Chrono should be able to work with boost 1.44.</p>