5 POSIX specification: @url{http://www.opengroup.org/susv3xsh/sendto.html}
9 Portability problems fixed by Gnulib:
12 On Windows platforms (excluding Cygwin), error codes for @code{accept} are not
13 placed in @code{errno}, and @code{WSAGetLastError} must be used instead.
16 Portability problems not fixed by Gnulib: