title: ProGuard: can't find referenced class (to R.java)
body: <p>I have an Android app that references to a library Android project. That setup basically works fine (as debug release in Eclipse). However, when I try to export a signed release apk of the main app, with ProGuard enabled in project.properties, export fails.</p>
  
  <p>Problem seems to be that ProGuard can't find the resource class R.java of the referenced library project, because all warnings complain about R$string, R$layout, etc. of that library project.</p>
  
  <p>I am using Android's default proguard.cfg file.<br>
  Do I need any changes in that case?</p>
  
  <p>Thanks in advance!</p>