$ cp foo.otf /usr/share/fonts/
$ fc-cache -fv
$ fc-list
$ kpsewhich foo.otf
$ otfinfo --features /usr/share/fonts/foo.otf
$ vim foo.tex
% foo.tex \font\foo="Foo":+kern;+liga;+zero \foo abcdefg 1234567890. \bye
$ xetex foo.tex
$ edpfview foo.pdf