title: How to make Proguard ignore external libraries?
body: <p>I want to use Proguard mainly for obfuscation reasons.</p>
  
  <p>My problem is that I have three libraries, Twitter4J and two signpost libraries. These libraries caused errors when I tried to create an signed APK.  To get over this I put the following in the <code>proguard.config</code> file...</p>
  
  <pre><code>-dontwarn org.apache.commons.codec.binary.** 
  -dontwarn org.slf4j.** 
  -dontwarn com.sun.syndication.io.**
  -dontwarn com.sun.syndication.feed.synd.*   
  </code></pre>
  
  <p>While this got rid of the errors in the console, when i loaded my signed APK onto my mobile phone it instantly crashed.  The DDMS said this was due to a class not found in Twitter4J.   </p>
  
  <p>Getting rid of the <code>"dontwarns"</code> above did not help.  Neither did adding <code>dontshrink  dontoptimise</code>.</p>
  
  <p>I would  like Proguard to completely ignore the libraries (as they are open source anyway).  Is this possible?</p>