This looks like a build issue with -stable packages, which have copied the tars from release rather than building fresh when the PKGNAME was unchanged, so @depend lines were incorrect. (The tgz are different due to being re- signed but ungzip them and the tars are identical, and different than if you build yourself from 7.6-stable).
> which I think could be solved by just upgrading python-tkinter to *p1. It's not really the correct fix but pragmatically it's the simplest one so I've done that, new -stable packages are likely to show up later today. -- Please keep replies on the mailing list.