In Slackware I do (stolen from a post here on linuxpackages.net):
Code:
/usr/X11R6/bin/mkfontscale /usr/share/fonts/
/usr/X11R6/bin/mkfontdir /usr/share/fonts/
/usr/X11R6/bin/mkfontdir -e
/usr/X11R6/lib/X11/fonts/encodings
/usr/X11/bin/fc-cache
and then restart the x-server
edit: fixed typo