title: NDK_ROOT not defined. Please define NDK_ROOT in your environment
body: <p>I have a problem regarding to cocos2dx v3 setting up android on mac. I use this video (<a href="https://www.youtube.com/watch?v=2LI1IrRp_0w" rel="nofollow">https://www.youtube.com/watch?v=2LI1IrRp_0w</a>) as a guide. In the video everything is doing fine but on my own eclipse, there's an error that shows up under my console tab. This is the statement error that I found : "python /Users/kirbyasterabadilla/Desktop/OracleEye/proj.android/build_native.py -b release all 
  NDK_ROOT not defined. Please define NDK_ROOT in your environment".</p>
  
  <p>I also tried installing NDK plugin inside my eclipse IDE but still can't solve the problem. </p>
  
  <p>Please help me with this one. What should I do to make this error disappear? </p>