Github user jpeach commented on the issue:
https://github.com/apache/trafficserver/pull/653
FWIW this didn't build on OS X:
```
In file included from ../../iocore/hostdb/I_HostDBProcessor.h:34:
../../iocore/hostdb/P_RefCountCache.h:615:3: error: use of undeclared
identifier 'TEMP_FAILURE_RETRY'
TEMP_FAILURE_RETRY(close(dir_fd));
...
In file included from ../../iocore/hostdb/I_HostDB.h:38:
../../iocore/hostdb/I_HostDBProcessor.h:363:14: error: flexible array
member 'info' of type 'HostDBInfo []' with non-trivial destruction
HostDBInfo info[];
```
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