title: Unknown reference to __dlopen in dlopen
body: <p><code>dlopen</code> is located in <code>libdl.a</code> but when I link my application against <code>libdl.a</code> , gcc linker throw this error : <code>unknow reference to __dlopen called in dlopen</code></p>
  
  <p>Should I import another <code>.a</code>?</p>