Newly built xmahjongg wouldn't run, until doing a "bdftopcf xmahjongg.bdf | gzip -c > xmahjong.pcf.gz && mkfontdir && xset fp rehash" in /usr/XllR6/lib/X11/fonts/misc. It occurs to me that other X packages might install their own fonts, too, and that perhaps there should be a generic target for this.