Já experimentou o que está no readme do pacote Oki?
3.0 INSTALLATION
a) login as root
# su - root
b) execute install.sh
# ./install.sh
5.0 CREATE QUEUE(S)
a) start a browser
b) populate location bar with 'http://localhost:631'
c) follow prompts to create queue
d) select Make - 'OKI'
e) select Model - 'OKI B4000 / B400 / MB400 PS'
f) follow remaining prompts until queue is created
O conteúdo do pacote é: CÓPIA OK400PS.ppd install.sh okijobaccounting readme.pdf uninstall.sh