title: How to set the CMAKE_PREFIX_PATH?
body: <p>I have a problem with the global environmental variable <code>CMAKE_PREFIX_PATH</code>. I already set this and I can see it is set when I type <code>env</code>, but when I run <code>cmake .</code> to build HipHop, it tells me that the variable isn't set.</p>
  
  <p>Is there a way I can hard-code this into the makefiles?</p>