Is there a way to unset the built-in -u option to diff command?

Greetings, All!

I'm exhausted of ideas...
I want diff command to simple show the changed lines as per diff -cb or diff -b
Any way to unset built-in -u flag? It does set it even to the external diff command...

-- 
WBR,
 Andrey Repin (anrdaemon_at_freemail.ru) 03.04.2009, <21:29>
Sorry for my terrible english...
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