title: Flex and Bison on Mac OS X Lion with Xcode 4.3.2
body: <p>I want to develop my own C compiler to get deeper into flex and bison for my compiler lessons at University, but I can't find flex and bison, which I've seen described in some other posts. Do I need to install extra packages for Xcode or is there any other way?</p>
  
  <p>I'm running Mac OS X Lion and have Xcode 4.3.2.</p>