title: cmake find_path not working as expected
body: <p>I have the following CMake script, it <strong>works</strong>:</p>
  
  <pre><code>find_path(
    GLES_SDK_INCLUDE_DIR
    NAMES "GLES2/gl2.h"
    PATHS "${CMAKE_FRAMEWORK_PATH}/include")
  </code></pre>
  
  <p>But this one returns a <code>-NOTFOUND</code>:</p>
  
  <pre><code>find_path(
    GLES_SDK_INCLUDE_DIR
    NAMES "gl2.h"
    PATHS "${CMAKE_FRAMEWORK_PATH}/include/GLES2")
  </code></pre>
  
  <p>Why? Any idea?</p>