Hello,
Here are Cygwin packages for the BLT Tcl/Tk Extension library, a fairly popular set of extension widgets for Tcl/Tk.
These are for use with the native Tcl/Tk libraries, not X11 builds.
http://www.santafe.edu/~mgd/cygwin/blt/blt-3.0-1-src.tar.bz2 http://www.santafe.edu/~mgd/cygwin/blt/blt-3.0-1.tar.bz2
Here is the setup.hint file:
category: Libs requires: tcltk sdesc: "Extension widgets for Tcl/Tk" ldesc: "BLT is an extension to the Tk toolkit, adding new widgets, geometry managers, and miscellaneous commands."