pd-hid caught in unstable, but why?

[Hans-Christoph Steiner]

I was just checking in on my packages, it seems that pd-hid is caught in
unstable for 75 days, but I can't figure out what the issue is.  The
error message is "Adding pd-hid makes 1 non-depending packages
uninstallable on kfreebsd-amd64: pd-hid "

http://release.debian.org/migration/testing.pl?package=pd-hid;expand=1

But what is that 1 non-depending package?  Is it 'puredata (<<0.43)'?
Other packages with that same Build-Depends are already in testing.

.hc