Thank you for taking the time and testing the TK bindings and looking in to this. I don’t think I understand Cmake because it seems to me I have the variables set, as my CMakeCache.txt does include:
...
//ADVANCED property for variable: TCL_INCLUDE_PATH
TCL_INCLUDE_PATH-ADVANCED:INTERNAL=1
...
//Path to a file.
TCL_INCLUDE_PATH:PATH=C:\Miniconda3\pkgs\tk-8.6.8-hfa6e2cd_0\Library\include
etc...
But maybe it wouldn’t work anymore anyway.