[PEAR] Fonctionnement étrange

Bonjour,

J'essaie d'installer PHPUnit via PEAR et j'ai un comportement assez bizarre.
Je suis sous windows XP SP3, Wamp, PHP 5.2.11

Voilà ce que je fais :
D'abord je mets à jour les catalogues de packages

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C:\wamp\bin\php\php5.2.11>pear update-channels
Updating channel "components.ez.no"
Channel "components.ez.no" is up to date
Updating channel "doc.php.net"
Channel "doc.php.net" is up to date
Updating channel "pear.php.net"
Channel "pear.php.net" is up to date
Updating channel "pear.phpunit.de"
Channel "pear.phpunit.de" is up to date
Updating channel "pear.symfony-project.com"
Channel "pear.symfony-project.com" is up to date
Updating channel "pecl.php.net"
Channel "pecl.php.net" is up to date

Ensuite je mets à jour pear

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C:\wamp\bin\php\php5.2.11>pear upgrade PEAR
pear/PEAR is already installed and is the same as the released version 1.9.4 upgrade failed

Donc il me dit que je suis déjà dans la dernière version 1.9.4

Je lance l'installation de phpunit:

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C:\wamp\bin\php\php5.2.11>pear install -a pear.phpunit.de/PHPUnit
phpunit/PHPUnit requires PEAR Installer (version >= 1.9.4), installed version is 1.9.0
phpunit/File_Iterator requires PEAR Installer (version >= 1.9.2), installed version is 1.9.0
phpunit/Text_Template requires PEAR Installer (version >= 1.9.4), installed version is 1.9.0
phpunit/PHP_CodeCoverage requires PEAR Installer (version >= 1.9.4), installed version is 1.9.0
phpunit/PHP_CodeCoverage requires package "phpunit/File_Iterator" (version >= 1.3.0)
phpunit/PHP_CodeCoverage requires package "phpunit/Text_Template" (version >= 1.1.1)
phpunit/PHP_CodeCoverage can optionally use PHP extension "xdebug" (version >= 2.0.5)
phpunit/PHP_Timer requires PEAR Installer (version >= 1.9.2), installed version
is 1.9.0
phpunit/PHPUnit_MockObject requires PEAR Installer (version >= 1.9.4), installed version is 1.9.0
phpunit/PHPUnit_MockObject requires package "phpunit/Text_Template" (version >= 1.1.1)
phpunit/PHP_Invoker requires PEAR Installer (version >= 1.9.4), installed versio
n is 1.9.0
phpunit/PHP_Invoker requires package "phpunit/PHP_Timer" (version >= 1.0.1)
phpunit/PHP_Invoker requires PHP extension "pcntl"
phpunit/PHP_TokenStream requires PEAR Installer (version >= 1.9.4), installed version is 1.9.0
No valid packages found
install failed

Et là il me dit que je ne peux rien installer car mon PEAR est en 1.9.0 :cry:

Quelqu'un a une idée ?

Merci !