title: Unity: build and run for Android is unavialable
body: <p>My Unity IDE doesn't allow me to run the project for Android. I successfully do it for iOS, but the android section is totally disabled.<br>
  What am I missing?<br>
  I use AndroidSDK with both Android Studio and Eclipse - they normally build native projects and run them on devices and emulators. So, there must not be a problem with Android SDK.</p>
  
  <p><img src="https://i.stack.imgur.com/rdViZ.png" alt="enter image description here"></p>