After emerging kochi-substitute-20030809-r3, I found that ghostscript (and associated programs like gv) were no longer able to display Japanese, because they couldn't find Kochi-Mincho and Kochi-Gothic fonts any more. The resons is that the new ebuild moved those fonts and ghostscript was looking in the old place. This is in turn because the file /usr/share/ghostscript/7.07/lib/CIDFnmap.Koc has the old path hard-wired: /Kochi-Mincho (/usr/X11R6/lib/X11/fonts/truetype/kochi-mincho.ttf) ; /Kochi-Gothic (/usr/X11R6/lib/X11/fonts/truetype/kochi-gothic.ttf) ; Those lines should be: /Kochi-Mincho (/usr/share/fonts/kochi-substitute/kochi-mincho-subst.ttf) ; /Kochi-Gothic (/usr/share/fonts/kochi-substitute/kochi-gothic-subst.ttf) ; Re-emerging ghostscript didn't help.
This problem was fixed on 11 Oct. Please make sure you remerged ghostscript (>=-r4) after that date.
After "emerge sync", this does the trick. Note that ghostscript must be emerged by hand; "emerge world" does not pick this up.