title: How to enable boost library in xcode
body: <p>I have a problem with adding boost library to my project in Xcode.
  It seems that some parts of boost work correctly but when I use some of them I get the following errors.
  Example- boost fiber library:</p>
  <pre><code>Undefined symbols for architecture arm64:
    &quot;boost::fibers::future_category()&quot;, referenced from:
        std::make_error_code(boost::fibers::future_errc) in main.o
    &quot;boost::fibers::condition_variable_any::notify_all()&quot;, referenced from:
        boost::fibers::condition_variable::notify_all() in main.o
    &quot;boost::fibers::mutex::lock()&quot;, referenced from:
        std::__1::unique_lock&lt;boost::fibers::mutex&gt;::unique_lock(boost::fibers::mutex&amp;) in main.o
    &quot;boost::fibers::mutex::unlock()&quot;, referenced from:
        std::__1::unique_lock&lt;boost::fibers::mutex&gt;::unlock() in main.o
        std::__1::unique_lock&lt;boost::fibers::mutex&gt;::~unique_lock() in main.o
    &quot;boost::fibers::wait_queue::empty() const&quot;, referenced from:
        boost::fibers::condition_variable_any::~condition_variable_any() in main.o
        boost::fibers::mutex::~mutex() in main.o
  ld: symbol(s) not found for architecture arm64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>