gizmo98
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# cd /RetroPie/emulators/

…and do this…
http://www.raspberrypi.org/forums/viewtopic.php?f=78&t=18853

If everything runs edit your es_systems.cfg and add the following lines:

DESCNAME=QUAKE 3
NAME=quake3
PATH=/home/pi/RetroPie/roms/quake3
EXTENSION=.txt
COMMAND=xinit /home/pi/RetroPie/emulators/quake3/build/release-linux-arm/ioquake3.arm

Finally you must create a empty *.txt file (like start.txt) under RetroPie/roms/quake3.