title: What does cmake .. do?
body: <p>I got the Box2D  project source and want to compile the testbed portion of it.
  The project folder contains folders like: freeglu glui testbed(a demo) helloword(a demo)
  Box2D Build CMakeFiles</p>
  
  <p>There are many CMakeLists.txt in all the different folders.
  I was thinking that I should cmake all those files so that make files are created in all places required.
  I read this (as instructions to do do want I want) :</p>
  
  <pre><code>wget http://box2d.googlecode.com/files/Box2D_v2.2.1.zip
  unzip Box2D_v2.2.1.zip
  cd Box2D_v2.2.1/Build
  cmake ..
  make
  </code></pre>
  
  <p>What does the cmake .. do?
  There is no CMakeLists.txt in the build folder.</p>