title: Linking boost libraries
body: <p>I have downloaded the boost library (version 1.46.1), but I don't know how to link it through xcode.I found an old question says to put the -lfftw3 flag, so I've put it.<br>
  I also added the path: /home/Documents/C++/boost_1_46_1 (it's the directory where I have put the library), but I am getting an error from the linker:  </p>
  
  <pre><code>ld: warning: directory not found for option '-L/home/ramy/Documents/C++/boost_1_46_1'
  ld: library not found for -lfftw3
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  Command /Developer/usr/bin/clang++ failed with exit code 1  
  </code></pre>
  
  <p>So the question are two:<br>
  1)How to manage xcode to link boost?<br>
  2)Where to put the library in file system? In linux there was /usr/lib, here there isn't this path, should I put it in /Developer/usr/lib?</p>