Symbol not found: _modperl_handler_anon_add failing apache2 startup

[mauritz.lovgren@…]

I am getting the following error while starting port apache2 after having installed the following using latest MacPorts with updated ports tree:

install perl5 +threads (to make mod_perl2 compile)
install apache2
install mod_perl2

sudo /opt/local/apache2/bin/apachectl start

httpd: Syntax error on line 118 of /opt/local/apache2/conf/httpd.conf: Cannot load /opt/local/apache2/modules/mod_perl.so into server: dlopen(/opt/local/apache2/modules/mod_perl.so, 10): Symbol not found: _modperl_handler_anon_add\n  Referenced from: /opt/local/apache2/modules/mod_perl.so\n  Expected in: dynamic lookup\n

What might cause this and how can I get around it?