Lien :
https://wiki.openbsd.fr.eu.org/doku.php/openbsd.org/faq/ports/ports.html
local$ sudo su
Password:
local#
local# cd /tmp
local#
local# ftp https://cdn.openbsd.org/pub/OpenBSD/$(uname -r)/{ports.tar.gz,SHA256.sig}
local# signify -Cp /etc/signify/openbsd-$(uname -r | cut -c 1,3)-base.pub -x SHA256.sig ports.tar.gz
local# cd /usr
local# tar xzf /tmp/ports.tar.gz
local# cd /usr/ports/games/chocolate-doom/
local# make install
local# cd /usr/ports/games/freedoom/
local# make install
local# chocolate-doom-setup
local# chocolate-doom