HUMBUG! perl/Tk is actively maintained and has the huge advantage over other GUI toolkits that it has close to no dependencies, making it easy to get it work on almost any OS.
perl/tk is not a binding to Tk, it is a port of Tk source to perl.
Nick I-S had partially automated this to keep up with updates,
but Tk 8.5 is not an update. The file names are changed with
the whole ttk tree added. It would be a new port from scratch.