title: How can I make clang-3.1 appear in the compiler list of XCode?
body: <p>My question is somewhat tied to <a href="https://stackoverflow.com/questions/11277347/clang-3-1-on-xcode-4-2-snow-leopard">this question.</a><br>
  I have OSX Lion, installed macports clang-3.1 but I think I do not see it appearing among Xcode compilers (which are LLVM GCC 3.1 and Apple LLVM compiler 3.0). I have XCode 4.2.</p>
  
  <p>How can I make clang-3.1 appear in the compiler list of XCode?<br>
  Any input is appreciated.</p>