I have problems installing PHPUnit 3.4.6 via PEAR 1.9.0. After I discover channel pear.phpunit.de and try to use one of following commands:
pear install phpunit/PHPUnit
pear install --alldeps phpunit/PHPUnit
pear install --onlyreqdeps phpunit/PHPUnit
No releases available for package
pear remote-list -c phpunit
Cannot download non-http URL "/c/categories.xml"
I had the same problem yesterday, and solved it by updating the channels
pear clear-cache pear update-channels
before trying to install phpUnit.
Hope this helps.