[Zope] pb avec MYSQL DA ET DB

[veronique]

I've downloaded my MySQL DA but Zope can't seem to find MySQL on my system (Zope and MySQL are installed in
 different directories). Is there someplace I can add a command so that Zope will look outside of its
 immediate vicinity? Judging by the messages, it's not looking very far afield:
 File /home/nancy/Zope-2.5.1-linux2-x86/lib/python/OFS/Application.py, line 531
 , in import_product
   File /home/nancy/Zope-2.5.1-linux2-x86/lib/python/Products/ZMySQLDA/__init__.p
 y, line 91, in ?
   File /home/nancy/Zope-2.5.1-linux2-x86/lib/python/Products/ZMySQLDA/DA.py, lin
 e 92, in ?
   File /home/nancy/Zope-2.5.1-linux2-x86/lib/python/Products/ZMySQLDA/db.py, lin
 e 89, in ?
 ImportError: No module named _mysql

 Thanks.
merci pour votre reponse
je suis debutante