@Addison : The files and folder have root owner while you seems to be running as "user"

run the following commands -
sudo gainroot <Not sure what the command is on N800 to switch user to root>
cd /usr/bin/
chmod 777 adom-qemu
cd adom-qemu
chmod 777 *
exit <To return to the original user>

then run the other commands

Source has not been released for DoomRL but the dependencies given in the readme are lua5.1, timidity, sdl and sdl_mixer.