no packages installed in channel pecl.php.net / Error: Command "PEAR2_HTTP_Request" is not valid.

[brucebnu]

example 1
$ php pyrus.phar list-packages
Pyrus version 2.0.0a4 SHA-1: 72271D92C3AA1FA96DF9606CD538868544609A52
Using PEAR installation found at /home/niujiajie/src/myProject/vendor
Listing installed packages [/home/niujiajie/src/myProject/vendor]:
[channel pecl.php.net]:
(no packages installed in channel pecl.php.net)
[channel pyrus.net]:
(no packages installed in channel pyrus.net)
[channel pear2.php.net]:
(no packages installed in channel pear2.php.net)
[channel pear.php.net]:
(no packages installed in channel pear.php.net)
[channel doc.php.net]:
(no packages installed in channel doc.php.net)
[channel __uri]:
(no packages installed in channel __uri)

Example 2
$ php pyrus.phar install PEAR2_HTTP_Request
Error: Command "PEAR2_HTTP_Request" is not valid.
$ php pyrus.phar install pear/PHP_CodeSniffer-1.5.0RC2
Error: Command "pear/PHP_CodeSniffer-1.5.0RC2" is not valid.