Can't index Chinese encoding for fonts.dir

[alphachi]

When installed /usr/ports/x11-fonts/wqy, I found there aren't any entries
about Chinese encoding in /usr/local/lib/X11/fonts/wqy/fonts.dir, just like
"...-gb18030.2000-0", "...--gb2312.1980-0", "...-gbk-0", so X programs can
not correctly display Chinese characters.

I used command mkfontscale/mkfontdir for rebuilding fonts.dir, but still no
Chinese items. Examined the localization set, that is no problem:
zh_CN.UTF-8.

There is also another machine,  exactly the same software installed with
this, but the machine is OK.

What problem is this? thanks!