http://bugs.winehq.org/show_bug.cgi?id=26031
--- Comment #53 from Dan Kegel dank@kegel.com 2013-08-25 11:45:36 CDT --- Was this fixed on mac by http://source.winehq.org/git/wine.git/?a=commit;h=197041f1ffe4841b0514701fd2... which sets SO_REUSEPORT on Mac if SO_REUSEADDR was specified?
If so, https://lwn.net/Articles/542629/ says this option is available on Linux as of kernel 3.9, and switching the #ifdef __APPLE__ to #ifdef HAVE_SO_REUSEADDR might make sense.