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diff --git a/src/library/scalax/collection/generic/AddableBuilder.scala b/src/library/scalax/collection/generic/AddableBuilder.scala
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+++ b/src/library/scalax/collection/generic/AddableBuilder.scala
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+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListBuffer.scala 14378 2008-03-13 11:39:05Z dragos $
+
+package scalax.collection.generic
+
+import collection.mutable.ListBuffer
+import collection.immutable.{List, Nil, ::}
+
+class AddableBuilder[CC[B] <: Iterable[B] with Addable[CC[B], B], A](empty: CC[A]) extends Builder[CC, A] {
+  protected var elems: CC[A] = empty
+  def +=(x: A) { elems = elems + x }
+  def elements: Iterator[A] = elems.elements
+  def clear() { elems = empty }
+  def result: CC[A] = elems
+}