src/client.c | 4 4 + 0 - 0 !
1 file changed, 4 insertions(+)

 try to fix build on kfreebsd/debian

Looks like we need to set _XOPEN_SOURCE on kFreeBSD for TCP_KEEPIDLE,
TCP_KEEPINTVL, and TCP_KEEPCNT definitions. This is just a guess
though.