I am waiting for SDLMAME v0.164 64-bit to be released and they didn't released it yet for MAC and Windows at all. Yes, I am using MAC and they didn't released for both as well.
EDIT: Neve rmind.. His twitter:
r0ni @sdlmame_osx Jul 29 I wil not be able to post updated builds until next week for 0.164, in currently out of town for business.