$ istanbul
Traceback (most recent call last):
  File "/usr/bin/istanbul", line 30, in ?
    from istanbul.main import main
  File "/usr/lib/python2.4/site-packages/istanbul/main/main.py", line 33, in ?
    from istanbul.main.gconf_client import GConfClient
  File "/usr/lib/python2.4/site-packages/istanbul/main/gconf_client.py", line 19, in ?
    import gconf
ImportError: No module named gconf