[Samba] Samba 4 installation problem

[wilson kwok]

Hello,
 
I'm trying install Samba 4 by this link http://wiki.samba.org/index.php/Samba4/HOWTO . The step 2 compile and step 3 install completed, but step 4 provisionhas following error:
 
[root at samba4 setup]# ./provision --realm=sfa.local --domain=sfa --adminpass=5555 --server-role='domain controller'Traceback (most recent call last):  File "./provision", line 32, in ?    import sambaImportError: No module named samba
 
Could someone has experience to fix this problem ?
 
Thanks
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