XP Serial port control

I am trying to use the serial port from perl, but I need O_NONBLOCK. I
thought I had this working on Win2k, but on XP I get: "vendor has not
defined Fcntl macro O_NONBLOCK". I've tried other various methods such
as IO::Select (which does not work), and I tried Serialport.pm which
predates XP! Anyone have suggestions for XP? I'm stuck! How can I
not block with a serial port?

.

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