Just a few posts above this one:
http://openarena.ws/board/index.php?topic=4748.msg46796#msg46796The one you said you managed to have working with OA.
Considering OA is probably using the same QVM format as ioquake3, I can guess OA gamecode
may somehow work within ioquake3 (meant as q3a+ioquake engine... that you download from ioquake3 site), as a mod.
It's just a theory, I never tried that. And anyway some oa features would have problems (e.g. no model for Double Domination points in q3a!).
Or Jackash could recompile the patch with the switches to make the qvm format compatible with the original q3a... some problems due to missing oa stuff in q3 may appear anyway.