Fwd: Got any 'fileno_unlocked'?

["Rick Hanson" <cryptorick at gmail dot com>]

Hi!  I'm trying to build some software under cygwin which has calls to
a library function called 'fileno_unlocked'.  My cygwin gcc cannot
find it, i.e. I get

undefined reference to `_fileno_unlocked'

at linktime.  This function is apparently in libc on Linux and
BSD-like systems.  Where can I find it on cygwin?  Thanks for any
help.  --Rick

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