Python UCS4 error

Dear All,
I updated my development machine with Fedora 15 and as there is python 2.7.
I have also migrated my few postgresql databases. While creating plpython in
one database, I got the following error undefined symbol
PyUnicodeUCS4_AsEncodedString.
Then I recompiled source code and got a plpython.so compiled for python 2.7
(default python comes with fedora15) and replaced original with this one.
Restarted postgresql and still same error occurs.
When checked for where a python is with ucs4 or ucs2 using following
script, it says it is ucs4.

>>> import sys
>>> print sys.maxunicode
1114111

How to solve this error?
Waiting for your help !

Regards,

C P Kulkarni