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Portable Scheme interface to the Tk graphical user interface toolkit

This is the initial SourceForge release of PS/Tk,
a portable Scheme library that provides access to
the Tk graphical user interface toolkit. New
maintainer Phil Bewig thanks those who came before
him:

- Sven Hartrumpf wrote Scheme_wish in 1997.

- Wolf-Dieter Busch wrote Chicken/Tk in 2004,
based on Scheme_wish.

- Nils M Holm wrote the portable PS/Tk in 2006,
based on Chicken/Tk.