bjori@lindsay:~$ pear install http://doc.php.net/phd/PhD-0.2.0.tgz
downloading PhD-0.2.0.tgz ...
Starting to download PhD-0.2.0.tgz (23,669 bytes)
.......done: 23,669 bytes
install ok: channel://__uri/PhD-0.2.0
bjori@lindsay:~$ mkdir build && cd build
bjori@lindsay:~/build$ phd /path/to/your/phpdoc/checkout

Getting the code:

$ cvs -d:pserver:cvsread@cvs.php.net/repository co phd

Install and run from CVS:

$ cd phd
$ pear install -f package.xml
$ phd -d/path/to/phpdoc/.manual.xml

Alternately you can (although not recommended) run PhD directly from CVS, without needing to install it:

$ cd phd
$ php build.php -d/path/to/phpdoc/.manual.xml