A C/C++ compiler from Borland for the Microsoft Windows platform.
A free version can be downloaded from: http://www.borland.com/products/downloads/download_cbuilder.html
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Helmut Giese has made patches available to build the tcl/tk core with this compiler. http://sourceforge.net/tracker/index.php?func=detail&aid=436116&group_id=10894&atid=310894
Tcl 8.4 comes with a makefile for borland.
Further details can be found at: http://www.ratiosoft.com/tcl/borland