Aqua Emacs compatibility?

I'm running Aqua Emacs 1.8c2 on a Mac with the latest git-emacs from github. I installed git from MacPorts (version 1.5.6.2). It lives in /opt/local/bin, which is in my search path. git-emacs correctly reports the green/red status for a file, but if I try to check it in (C-x v v), nothing happens. In the Messages buffer, I get this:

ad-Orig-error:

No other error text. My working theory is that git-emacs is unable to find the git binary. I even tried hard-coding the path into git-exec, but to no avail. Any ideas?

[tsgates]

Sorry for being late,

Could you try to set up your name / email with commands, "git config user.name XXX" and email?

Please report again.

Played with this more. Sure enough, failing to set user.name and user.email caused the problem. Odd, since it seems to work in some cases and not others. You probably want to indicate something more useful when this fails.