php site-packages/include_path dir?

[Andrew Pantyukhin]

I want to port nusoap (http://sourceforge.net/projects/nusoap/) -
just a few *php files, one of them should be included by php
scripts.

Where can I install the files so that it all works out-of-the-box?
I mean so that you don't have to write the whole path in
require_once? i see that include path is set to curdir by default,
but that can be changed by an additional ini in
/usr/local/etc/php. Should I create nusoap.ini there with desired
paths?

Thanks!