Just set up a FreeBSD jail to run httpd in it and all works good except these two, rewrite/proxy modules.
These are error logs excerpts:
[rewrite:crit] [pid 43447] (13)Permission denied: AH00666: mod_rewrite: could not init rewrite_mapr_lock_acquire in child
[proxy:crit] [pid 43447] (13)Permission denied: AH02479: could not init proxy_mutex in child
Not sure permissions of what are being denied as html in document root is being served just fine when these modules are disabled.
I tried googling but found nothing but rubbish.