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Flex scanners call fileno() in order to get the file descriptor
corresponding to yyin. The file descriptor may be passed to
isatty() or read(), depending upon which %options you specified.
If your system does not have fileno() support, to get rid of the
read() call, do not specify %option read. To get rid of the isatty()
call, you must specify one of %option always-interactive or
%option never-interactive.