''start fire'' \\
''douse fire''\\
''fuel fire''\\
''cook MEAT''\\

To build a campfire, you must first ''gather'' firewood and drop it somewhere
outdoors. You can then use flint and steel to ''start fire'', creating a campfire.
You may need to add more firewood occasionally, to keep it going, with the ''fuel
fire'' command.

If you have fish, or a limb rent from a corpse, you can ''cook MEAT'' to throw it
on the fire, and let the flames do all the work. To acquire food, you can ''rend''
a limb from a corpse or use a fishing rod to ''fish'' in a pond.