PyQt4.QtWebKit.QWebFrame missing findAllElements() method on debian

Question

I recompiled PyQt4 from source, but the issue still exists.
On another ArchLinux system, it works well. Can someone help me?
Thanks!

on Debian:

>>> import PyQt4.QtWebKit
>>> dir(PyQt4.QtWebKit.QWebFrame.findAllElements)
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: type object 'QWebFrame' has no attribute 'findAllElements'

on ArchLinux:

>>> import PyQt4.QtWebKit
>>> dir(PyQt4.QtWebKit.QWebFrame.findAllElements)
['__call__', '__class__', '__cmp__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__module__', '__name__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__self__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__']