--- a/langtools/src/share/classes/com/sun/tools/javac/util/BaseFileManager.java	Mon Nov 29 10:09:48 2010 -0800
+++ b/langtools/src/share/classes/com/sun/tools/javac/util/BaseFileManager.java	Mon Nov 29 14:15:36 2010 -0800
@@ -59,7 +59,7 @@
  * There are no references here to file-system specific objects such as
  * java.io.File or java.nio.file.Path.
  */
-public class BaseFileManager {
+public abstract class BaseFileManager {
     protected BaseFileManager(Charset charset) {
         this.charset = charset;
         byteBufferCache = new ByteBufferCache();
@@ -163,6 +163,9 @@
         }
         return -1;
     }
+
+    public abstract boolean isDefaultBootClassPath();
+
     // </editor-fold>
 
     // <editor-fold defaultstate="collapsed" desc="Encoding">