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Rafaël Carré authored
It was added to fix this FreeBSD 8 error: sock.c:736: error: 'IPPROTO_IPV6' undeclared The need for __BSD_VISIBLE was removed in: https://github.com/freebsd/freebsd/commit/fcb67434842e8a1a8ba60a2607b55922d35887fb#diff-dab66d274da3dd4ba168b2ba7f3b4374 Which predates the last supported FreeBSD releases
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