title: Android Studio NDK error, couldn't find GLES3/gl3.h although it exist
body: <p>I'm trying to make an app on Android Studio that use the NDK and OpenGL ES 3.0.When I #include &lt; GLES3/gl3.h >, the IDE has auto completion as I typing, I think it's a sign meaning that the IDE can find it 
  However, I got the error : <strong>"Error:(22, 10) fatal error: 'GLES3/gl3.h' file not found"</strong> when I build the project. I check the NDK path in Project Structure, which is :</p>
  
  <pre><code>sdk\ndk-bundle\platforms\android-21\arch-arm64\usr\include\GLES3
  </code></pre>
  
  <p>it's correct and the GLES3/gl3.h does exist there.</p>
  
  <p>I have declared my CMakeList with GLESv3 already:</p>
  
  <pre><code>cmake_minimum_required(VERSION 3.4.1)
  
  # now build app's shared lib
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall")
  
  add_library(gl3jni SHARED
              gl_code.cpp
              stb_image.cpp
              )
  
  # add lib dependencies
  target_link_libraries(gl3jni
                        android
                        log 
                        EGL
                        GLESv3)
  </code></pre>
  
  <p>I also declare the OpenGL ES version in the Manifest.xml with:</p>
  
  <pre><code>&lt;uses-feature android:glEsVersion="0x00030000" android:required="true"/&gt;
  </code></pre>
  
  <p>What am I doing wrong?</p>