[plt-scheme] How can I make ~% output automatcially either #\return#\newline or simply #\newline

I want to write something like

        fprintf output "assdfs   ~%" ...)

and have the line termination character sequence automatically
adjust to carriage return line feed on Windows platforms and just
line feed on unix platforms.

I'm compiling on Windows with mzc  and it is only outputting
a line feed character.

Thanks in advance.

John

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