title: How to specify a custom stdlib directory for LLVM
body: <p>I have LLVM 3.3 with Clang, and </p>
  
  <pre><code>$ /tmp/clang/bin/clang -print-search-dirs
  programs: =/tmp/clang/bin:/usr/lib/gcc/i486-linux-gnu/4.4/../../../../i486-linux-gnu/bin
  libraries: =/tmp/clang/bin/../lib/clang/3.3:/usr/lib/gcc/i486-linux-gnu/4.4:/usr/lib/gcc/i486-linux-gnu/4.4/../../../../lib32:/usr/lib/../lib32:/usr/lib/i486-linux-gnu/../../lib32:/usr/lib/gcc/i486-linux-gnu/4.4/../../..:/lib:/usr/lib
  </code></pre>
  
  <p>How can I instruct Clang to usage an stdlib (e.g. <code>libgcc</code>) directory other than <code>/usr/lib/gcc/i486-linux-gnu/4.4</code>? I'd like to make it use <code>/tmp/mygccstd</code> instead.</p>
  
  <p>It's also looking in <code>/usr/lib</code> and <code>/lib</code>. How do I disable that?</p>