jmode-skk requires a SKK server.
There are several SKK servers.
( The oldest one is skkserv. rskkserv seems obsolete.
dbskkd is newer and faster and more secure one.)
jmode-skk should require not only skkserv but one of the SKK servers.
Fix: attached /usr/ports/japanese/jmode-skk/Makefile fixes the problem.
How-To-Repeat: portupgrade -N jmode-skk
(this installs skkserv and his dictionary even if I have dbskkd already installed)
Please send the unified diff next time.