title: Android source build: duplicate class
body: <p>While building Android source code I am getting this error:</p>
  
  <blockquote>
    <p>out/target/common/obj/APPS/SystemUI_intermediates/src/com/android/systemui/R.java:10: duplicate class: com.android.systemui.R</p>
  </blockquote>
  
  <p>Even if I execute the <code>rm</code> command to remove that file or execute <code>make clean</code>. Why is that, and how do I deal with it?</p>