[Koha] Install on MacOSX fails at apache

I'm trying to install Koha 2.2.9 on an Intel Mac and it's not working. All the pieces work separately (mysql, perl and apache) and the koha install script completed successfully, but I can't see the koha web page on my machine. I'm reasonably sure it's a problem with the apache setup but I don't know where to start. The koha-httpd.conf file is in the correct users directory so apache is seeing it.