How to get access to Icinga on Apache 2.4?

I am trying to install Icinga on a FreeBSD 9.1 box with Apache 2.4. I use the Apache config which was provided with the Icinga port.

But when i try to access the web frontend, i get the following error in my log:

AH01276: Cannot serve directory /usr/local/www/icinga/: No matching DirectoryIndex (none) found, and server-generated directory index forbidden by Options directive

I have a DirectoryIndex directive in my httpd.conf, but not in the Icinga config snippet, which uses index.html as an index. The Options directive is Options None.

When i try to specify a custom Directory Index in the Icinga config snippet, i get the following error:

Invalid command 'DirectoryIndex', perhaps misspelled or defined by a module not included in the server configuration

So Google tells me that maybe my mod_dir isn't enabled. Well, it is not in the modules list in httpd.conf where i can uncomment the modules to load, but i have a DirectoryIndex directive in my httpd.conf which is accepted by Apache.

So i am struggling to get the Icinga web frontend to work, and i was hoping that anyone can help me.