Cannot build www/mod_dnssd with poudriere

[Raphael Kubo da Costa]

Wolfgang Riegler <wolfgang.riegler at gmx.de> writes:

>  o ./mod_dnssd.c && touch ./mod_dnssd.slo
> ./mod_dnssd.c:29:23: error: mod_unixd.h: No such file or directory
> ./mod_dnssd.c:911: warning: missing initializer
> ./mod_dnssd.c:911: warning: (near initialization for 'commands[8].func')

[...]

> ===>  Cleaning for ap22-mod_dnssd-0.6_12

mod_unixd.h is present in www/apache24, but not www/apache22, hence the
error. I'm not sure about the fix though? Is mod_dnssd supposed to work
with Apache 2.2?