[George Peter Staplin]: Sep 2, 2004 - The official Tcl 8.4.x has had the Cygwin build support removed, because it was in need of someone to maintain it, and no one came forward. You can still build Tcl and Tk in [Cygwin] using the [MinGW] packages. To do so you will need to do: export CC="gcc -mno-cygwin"; ./configure --prefix=/some/place/that/won't/conflict && make install You will not be able to use the Cygwin XFree86 server for Tk, unless you patch Tk. Pity. [TV] Maybe this page is informative though, it is possible, I made a windows build of a not so old tcl/tk which I use myself which has an X window interface on top of XP, using cygwin: [Tcl/Tk on Xwindows emulation on XP using Cygwin]. Assuming I can indeed get there maybe a good lecture/workshop subject for the next [Fosdem 2004].