This is from Tk800.012.tar.gz 
Please read "INSTALL" from Tk800.012.tar.gz for more info.

If you have a question with Tk800.012 and Undertow, please contact
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Tk is a Graphical User Interface ToolKit.           

Copyright (c) 1995-1998 Nick Ing-Simmons. All rights reserved.
This package is free software; you can redistribute it and/or
modify it under the same terms as Perl itself, with the exception
of all the files in the pTk sub-directory which have separate terms
derived from those of the orignal Tix4.1.0 or Tk8.0 sources. See doc/license.html
for details of this license.

This a re-port of a perl interface to Tk8.0.3 (Scriptics's production release). 

It also includes all the C code parts of Ioi Kim Lam's Tix4.1.0.006 release.
The perl code corresponding to Tix's Tcl code is not fully implemented.

This version also contains re-worked Image code based on tcl/tk Img extension 
by Jan Nijtmans <nijtmans@worldaccess.nl>

This version (Tk800.012) requires perl5.005 or later on Win32 
and 5.004_04 or later on UNIX.

Tk800.012 should build and run on Windows NT using Visual C++, Borland, 
or with the Mingw32 port of GCC with perl5.005 or later.
Can be built using ActiveState's binrary distribution 
(see README-ActiveState.txt).

The Mingw32 builds are a little buggy. In particular "native" getOpenFile
dialog seems to crash. I suspect Mingw32's <windows.h> include files.

I have not tried a Borland build recently.

Goal of 800.* is to incorporate native look-and-feel to Win32 port introduced
in tk8.0 while retaining as much of the perl-level API as it exists in Tk40?.*
as possible.

Author has built:
  Perl5.00502 
   SPARC Solaris2.6 and 2.5.1, gcc-2.8.1
   NT4.0 SP3, Mingw32  EGCS 1.0.2
   RedHat Linux 5.1 (x86), cc (i.e. gcc-2.7.?)
   
  ActivePerl 502e
   NT4.0 SP3, VC++ 5.0 Prof. Ed.