yes...you'll need to make sure that the include file path matches with the one that's set in the php.ini file. i don't know what platform you're working on, but the modified php.ini file in many unix implementations is located in /usr/local/lib.
the include path is typically /usr/local/lib/php/.
for apache, php 4.x needs this...
if you have compiled php as a module
LoadModule php4_module /usr/apache2/modules/libphp4.so
(this path may be different, depending on platform and apache version)
In the AddType section, uncomment the lines that specify the php filetypes:
AddType application/x-httpd-php3 .php3
AddType application/x-httpd-php3-source .phps
#
And for PHP 4.x, use:
#
AddType application/x-httpd-php .php
AddType application/x-httpd-php-source .phps
good luck.
knelson