I just tested VTK 8.2 on my own mac (using the system Python and Tcl, though).
VTK_USE_TK didn’t appear at first, but it appeared after I enabled VTK_Group_Tk.
The detected TCL_LIBRARY and TK_LIBRARY were incorrect, so I had to set them manually.
After that, the build succeeded and the vtkTkRenderWindowInteractor tests worked.