title: What is the -lrt flag in gnu-make?
body: <p>In a later stage of the gnu-make process gmake sent a command similar to:</p>
  
  <pre><code>gcc -static foo.so.0 bar.o bizz.o buzz.o -pthreads -lrt
  </code></pre>
  
  <p>In that command, what dos the -lrt mean?</p>