PEAR packages can't be located by PHP module?

Hi,

My Environment:
Apache 2.0.54 (Windows)
PHP 5.0.5
PEAR 1.4.11

My problem: it seems that require_once of any my PHP modules can't find
any PEAR package. For, example, I am using: require_once
'PHPUnit/Framework/TestCase.ph... for PHPUnit, but my sample fails to
run.
Include Path in PHP.ini is ".;C:\PHP\pear"
In command line "pear list" returns the list of my installed packages
(seems no problem).

What do I miss?

Thanks a lot for help!

Vadim

Additional Details

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