title: cmake error when configuring
body: <p>Sorry if this is not the right place to post this but I think the librocket forum is long dead. </p>
  
  <p>I have Ubuntu 12.04 and I followed the steps in building librocket <a href="http://librocket.com/wiki/documentation/BuildingWithCMake">here</a>.</p>
  
  <p>I'm using cmake as the steps said but when I pressed c to configure this error showed up:</p>
  
  <pre><code> CMake Error at
   /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:91
   (MESSAGE):
     Could NOT find Freetype (missing: FREETYPE_LIBRARY FREETYPE_INCLUDE_DIRS)
   Call Stack (most recent call first):
     /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:252
   (_FPHSA_FAILURE_MESSAGE)
     /usr/share/cmake-2.8/Modules/FindFreetype.cmake:83
   (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
     CMakeLists.txt:61 (find_package)
  </code></pre>
  
  <p>Any help? Thanks.</p>