fastcgi.server = (
".fcgi" =>
                    ( "localhost" =>
                        (
                            "socket" => "/tmp/textdrive-new.socket",
                            "bin-path" => "/users/home/website/web/public/dispatch.fcgi",
                            "bin-environment" => ( "RAILS_ENV" => "production" )
                        )
                    ),
".php" =>
                    ( "localhost" =>
                        (
                            "socket" => "/tmp/textdrive-php5-fcgi.socket",
                            "bin-path" => "/usr/local/www/cgi-bin/php5-fcgi",
                            "bin-environment" => (
                            "PHP_FCGI_CHILDREN" => "4",   
                            "PHP_FCGI_MAX_REQUESTS" => "5000"
                                                 )
                        )       
                    )
)

The following is my setup on OS X 10.4.2 using PHP 5.0.5

./configure --prefix=/usr/local/php5-fcgi --enable-fastcgi --enable-force-cgi-redirect --disable-cli --enable-memory-limit --with-layout=GNU --with-regex=php

make

sudo make install

The compile flags enable a fairly basic PHP setup, you may need to add more options for things like MySQL, etc. DO NOT ADD --with-apxs OR --with-apxs2 AS A COMPILE FLAG -- THESE ARE APACHE ONLY AND WILL PROBABLY BREAK UNDER LIGHTTPD!

Add the following to your lighttpd.conf file

fastcgi.server = ( ".php" =>
                   ( "localhost" =>
                     ( "socket" => "/tmp/php5-fcgi.socket",
                       "bin-path" => "/usr/local/php5-fcgi/bin/php"
                     )
                   )
                 )

Restart lighttpd, now with PHP support

fastcgi.server = (
                ".php" =>
                    ( "localhost" =>
                        (
                            "socket" => "/home/jah/tmp/jah-php5-fcgi.socket",
                            "bin-path" => "/usr/local/www/cgi-bin/php5-fcgi -c /home/jah/etc/php.ini",
                            "bin-environment" => (
                            "PHP_FCGI_CHILDREN" => "4",
                            "PHP_FCGI_MAX_REQUESTS" => "5000"
                                                 )
                        )
                    )
                 )