As root:
$ mkdir /var/run/mdnsd $ ls -lhU [...] rw------- 1 root wheel 0B Apr 11 01:41 logpriv drwxr-xr-x 2 root wheel 512B May 19 17:55 mdnsd drwxr-xr-x 2 nobody nobody 512B Apr 28 11:36 memcached drwxr-xr-x 2 murmur murmur 512B Jul 19 2014 murmur [...]