title: Proguard error when exporting signed app using android.support.v4.app honeycomb compatibility package
body: <p>I am using v4 compatibility package in my project, but when I try to export a signed app, I get the following message from Proguard. I've Googled the whole evening, but I didn't find the answer to solve this.</p>
  
  <pre><code>[2011-07-03 01:46:29 - worldscopeApp] Proguard returned with error code 1. See console
  [2011-07-03 01:46:29 - worldscopeApp] Warning: android.support.v4.app.ActivityCompatHoneycomb: can't find referenced method 'void invalidateOptionsMenu()' in class android.app.Activity
  [2011-07-03 01:46:29 - worldscopeApp] Warning: android.support.v4.app.ActivityCompatHoneycomb: can't find referenced method 'void dump(java.lang.String,java.io.FileDescriptor,java.io.PrintWriter,java.lang.String[])' in class android.app.Activity
  [2011-07-03 01:46:29 - worldscopeApp] Warning: android.support.v4.view.MenuCompatHoneycomb: can't find referenced method 'void setShowAsAction(int)' in class android.view.MenuItem
  [2011-07-03 01:46:29 - worldscopeApp]       You should check if you need to specify additional program jars.
  [2011-07-03 01:46:29 - worldscopeApp] Warning: there were 3 unresolved references to program class members.
  [2011-07-03 01:46:29 - worldscopeApp]          Your input classes appear to be inconsistent.
  [2011-07-03 01:46:29 - worldscopeApp]          You may need to recompile them and try again.
  [2011-07-03 01:46:29 - worldscopeApp]          Alternatively, you may have to specify the options 
  [2011-07-03 01:46:29 - worldscopeApp]          '-dontskipnonpubliclibraryclasses' and/or
  [2011-07-03 01:46:29 - worldscopeApp]          '-dontskipnonpubliclibraryclassmembers'.
  [2011-07-03 01:46:29 - worldscopeApp] java.io.IOException: Please correct the above warnings first.
  [2011-07-03 01:46:29 - worldscopeApp]   at proguard.Initializer.execute(Initializer.java:308)
  [2011-07-03 01:46:29 - worldscopeApp]   at proguard.ProGuard.initialize(ProGuard.java:210)
  [2011-07-03 01:46:29 - worldscopeApp]   at proguard.ProGuard.execute(ProGuard.java:85)
  [2011-07-03 01:46:29 - worldscopeApp]   at proguard.ProGuard.main(ProGuard.java:499)
  </code></pre>