Okay, I just need to add the font path into xorg.conf then?
Another question. Does the font files need to be at the directory I stated in xorg.conf or it can be in the sub-directories of the stated location in xorg.conf.
But the actually location of the font file is at /usr/local/fonts/opentype/Arial/Arial.otf
Does it matter?
Anyway, I have added the font path to /etc/fonts/fonts.conf
The Font selector on gnome can display the fonts correctly. but the things that I change doesn't reflect it.