problem installing and runnig normally python-ldap with more than 1 version of python

[walid aoudi]

i installed python 2.1.3 (i already have in my machine
python 1.5 and python 2.1.1)and open-ldap-2.1.17.
i installed python-ldap-1.10.alpha3 ,i think it's ok
but when i launch python from the shell i have this :
sh-2.05# python
Python 2.1.3 (#1, Apr 10 2003, 14:04:31) 
[GCC 2.96 20000731 (Red Hat Linux 7.2 2.96-112.7.2)]
on linux2
Type "copyright", "credits" or "license" for more
information.
>>> import ldap
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File
"/usr/local/lib/python2.1/site-packages/ldap/__init__.py",
line 21, in ?
    from _ldap import *
ImportError: /lib/libcrypt.soP: shared object not open
>>> import _ldap
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ImportError: `&#65533;crypt.so: shared object not open
>>> 

i think the problems comes from the fact that i have 3
versions of python installed on my pc, i don't want to
erase anyone but i would know how to make python 2.1.3
intercept the python-ldap libraries, is it with the 
setup.cfg file ?
please help me 
thanks in advance