Hi! A new contributor for Italian doc

Hi! I sent some contributions to italian documentation via edit.php.net logging with my Google account. I want to continue to work on italian traslation of the doc. I've correctly downloaded files via svn without problems (I used it in other projects), but I need help to install PhD. I tried: $ sudo pear install doc.php.net/PhD > and variants (--all-deps, --onlyreqdeps) but it says: phpdocs/PhD requires PHP extension "sqlite3" > phpdocs/PhD can optionally use package "phpdocs/PhD_PHP" > phpdocs/PhD can optionally use package "phpdocs/PhD_PEAR" > phpdocs/PhD can optionally use package "phpdocs/PhD_IDE" > phpdocs/PhD can optionally use PHP extension "posix" > phpdocs/PhD can optionally use PHP extension "haru" > phpdocs/PhD_Generic requires package "phpdocs/PhD" (version >= 0.9.0) > phpdocs/PhD_Generic can optionally use PHP extension "haru" > No valid packages found > install failed so I thought that the problem was sqlite3 extension that is not installed, therefore I tried to install it with pecl, but I got a lot of C compilation errors. What's wrong? Thank you :) Federico Reghenzani