Apache2 and PHP4.2.3 - errors

Hi all, I have recently upgraded to apache2 on my FreeBSD 4.6 box, and the upgrade worked well, the daemon was running and serving pages etc. So I installed the latest PHP build in my ports tree (4.2.3) and it compiled no problems, but when I added the required lines into my httpd.conf to make it run, I get the following error when I try and start apache # apachectl start Syntax error on line 273 of /usr/local/etc/apache2/httpd.conf: Cannot load /usr/local/libexec/apache2/libphp4.so into server: /usr/local/libexec/apache2/libphp4.so: Undefined symbol "pthread_getspecific" now line 273 of my httpd.conf file is

LoadModule php4_module        libexec/apache2/libphp4.so

And that file exists, so I really dont know what the problem is. Any help on this would be greatly appreciated. Chris