Hi, I've got apache2 with a custom httpd.conf but I get the following error:

Syntax error on line 16 of /path/to/httpd.conf:
Invalid command 'AddType', perhaps mis-spelled or defined by a module not included in the server configuration
I don't know why this error is occurring, the apache is emerged but started with the following line so it uses the pre-made apache conf:

/usr/sbin/apache2ctl -f /path/to/httpd.conf -DSSL -k start
If I comment out the AddType line that it refers to, the error simply picks the next one when I rerun apache2ctl

Does anybody know why this error occurs?