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Justin Brewer authored
strerror_r and addrinfo require _POSIX_C_SOURCE >= 200112L, which is implied by _XOPEN_SOURCE >= 600. With the removal of AF_LOCAL usage, the only non-standard features being used are the TCP_KEEP* socket flags. _DARWIN_C_SOURCE is required to expose TCP_KEEPALIVE. Fall back to using _XOPEN_SOURCE 600 for all platforms, and additionally define _DARWIN_C_SOURCE for Darwin. Signed-off-by:
Justin Brewer <jzb0012@auburn.edu>
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