# portupgrade -Rp x11/kde4
(中略)
/usr/local/lib/ruby/site_ruby/1.8/pkginfo.rb:74:in `initialize': : Not in due form: <name>-<version> (ArgumentError)
from /usr/local/sbin/portupgrade:931:in `new'
from /usr/local/sbin/portupgrade:931:in `do_upgrade'
from /usr/local/sbin/portupgrade:815:in `main'
from /usr/local/sbin/portupgrade:811:in `each'
from /usr/local/sbin/portupgrade:811:in `main'
from /usr/local/lib/ruby/1.8/optparse.rb:787:in `initialize'
from /usr/local/sbin/portupgrade:229:in `new'
from /usr/local/sbin/portupgrade:229:in `main'
from /usr/local/sbin/portupgrade:2208

こういうのほかのportsでもあるんだろうね