Openpyxl ausente 'jdcal'

Eu tentei instalar oopenpyxl módulo, mas durante a instalação ele mostrou alguns erros comJDcall. Quando tento importá-lo, recebo este erro:

 Traceback (most recent call last):
  File "C:\Andrzej\workspace\sandbox\sandbox.py", line 7, in <module>
    import openpyxl 

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\__init__.py", line 29, in <module>
    from openpyxl.workbook import Workbook

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\workbook\__init__.py", line 25, in <module>
    from .workbook import *

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\workbook\workbook.py", line 35, in <module>
    from openpyxl.worksheet import Worksheet

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\worksheet\__init__.py", line 25, in <module>
    from .worksheet import *

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\worksheet\worksheet.py", line 35, in <module>
    import openpyxl.cell

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\cell\__init__.py", line 25, in <module>
    from .cell import *

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\cell\cell.py", line 47, in <module>
    from openpyxl.date_time import (

  File "C:\Python34\lib\site-packages\openpyxl-2.0.5-py3.4.egg\openpyxl\date_time.py", line 34, in <module>
    from jdcal import (

ImportError: No module named 'jdcal'

Eu recebo esse mesmo problema para o Python 3.4 e 3.3, como posso resolvê-lo?