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POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/basedefs/sys_select.h.html
Gnulib module: sys_select
Portability problems fixed by Gnulib:
<sys/types.h>
to be included first.
struct timeval
on some platforms:
OSF/1 4.0.
<string.h>
before FD_ZERO
can be used—on some platforms:
AIX 7.1, Solaris 11 2011-11.
Portability problems not fixed by Gnulib: