title: How to point cmake to zlib include path?
body: <p>Or any include directory/library. </p>
  
  <p>I use cmake gui tool so I run it and usually the gui will highlight the include or library it can't find and let you open a open dialog to set the path however it doesn't do that for this cmake cofig it tell you in red text in the output in the gui tool, so,</p>
  
  <pre><code>CMake Error at C:/Program Files/CMake/share/cmake-3.0/Modules/FindPackageHandleStandardArgs.cmake:136 (message):
    Could NOT find ZLIB (missing: ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
  Call Stack (most recent call first):
    C:/Program Files/CMake/share/cmake-3.0/Modules/FindPackageHandleStandardArgs.cmake:343 (_FPHSA_FAILURE_MESSAGE)
    C:/Program Files/CMake/share/cmake-3.0/Modules/FindZLIB.cmake:101 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
    src/CMakeLists.txt:7 (find_package)
  </code></pre>
  
  <p>So still using the gui how do I point cmake to the zlib include dir?</p>