The Tk makefile.vc uses $(TCL_PATCHLEVEL) but never defines it. This results in a pkgIndex.tcl that fails to load Tk.
The attached patch corrects the problem by introspecting the tcl.h file for the correct patch level using the new functionality provided by nmakehlp.c for this purpose.
Please review, as I intend to commit this change soon.
v1 fix
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I've committed a fix for this as part of a general re-work to extract the various version numbers from the tcl and tk headers using nmakehlp new features.