[Distutils] Optional dependencies

[anatoly techtonik]

Greetings,

I see that "setup.py register" does not understand "extras_require"

>setup.py register
\Python25\lib\distutils\dist.py:263: UserWarning: Unknown distribution
option: 'extras_require'
  warnings.warn(msg)

Is there any other way to provide optional dependencies and give user
an ability to know about them and make a choice?

-- 
--anatoly t.