Gotta tag it as executable. Doesn't need to be in a specific directory, but if it's in, say, drive0/var it won't get erased by an upgrade.

Then "Q" outta the player from the shell. Execute it (./empacman) then type "exit" to get back into the player. Then fire up Hijack and it'll be there on the Hijack menu.

Optionally, you can start it up with each player boot from a custom init.