installation - PHP ssh extension

I'm trying to install the ssh extension of PHP following this article.

My machine is a Linux mpriki 2.6.26-2-686 #1 SMP Mon Jun 21 05:58:44 UTC 2010 i686 GNU/Linux (lenny13 distrubition

When I type aptitude install libssh2-1-dev libssh2-php everything seems to be OK, but when I run php -m |grep ssh2, the shell doesn't return anything, so I tried to follow the alternative installation.

First of all, I tried to download it with wget from here: http://surfnet.dl.sourceforge.net/sourceforge/libssh2/libssh2-0.14.tar.gz, but there was no file to download, so I tried another link: http://www.libssh2.org/download/libssh2-0.14.tar.gz

Then, when I type pecl install -f ssh2 is see the following message:

root@mpriki:~# pecl install -f ssh2
WARNING: failed to download pecl.php.net/ssh2 within preferred state "stable", will instead download version 0.11.3, stability "beta"
downloading ssh2-0.11.3.tgz ...
Starting to download ssh2-0.11.3.tgz (23,062 bytes)
........done: 23,062 bytes
5 source files, building
running: phpize
Configuring for:
PHP Api Version:         20041225
Zend Module Api No:      20060613
Zend Extension Api No:   220060519
 1. libssh2 prefix? : autodetect

1-1, 'all', 'abort', or Enter to continue:

I find this on superuser but when I run aptitude install libssh2-1-dev, it seems the package has been already been installed.

Edit: I found this link but even though I don't know what to do.

1-1, 'all', 'abort', or Enter to continue:

Enter a number (between 1 and 1) to install that module from the list; or the word "all" to install all found modules; or "abort" to abort installation.