A document ${LOCALBASE}/man/ja/man1/nkf.1.gz is broken. The bug was fixed in git repository at Dec. 16, 2013. However FreeBSD ports maintainer did not apply the patch. Please use GitHub to get recent source codes.
man nkf shows all clear. I think this is overcome by events.
There exist two documents for man. ${LOCALBASE}/man/man1/nkf.1.gz (in English) and ${LOCALBASE}/man/ja/man1/nkf.1.gz (in Japanese) First document is clear but the second is still broken.
Maintainer feedback, please.
Should be fixed by updating 2.1.4 (r463180). > The bug was fixed in git repository at Dec. 16, 2013. 2.1.4 should include the fix because 2.1.4 has been released Dec 12, 2015. This is the upstream bug: https://ja.osdn.net/projects/nkf/ticket/32546