openbsd-ports/www/ap2-mod_dnssd/pkg
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| Running ${PKGSTEM} on OpenBSD
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To enable the ap2-mod_dnssd module, the following lines need to be added
to ${SYSCONFDIR}/apache2/httpd2.conf:
    DNSSDEnable on
    LoadModule dnssd_module ${PREFIX}/lib/apache2/dnssd_module.so

Then httpd2(8) must be restarted.