[Zope] Zope refuses to start with relative EVENT_LOG_FILE

I couldn't find anything about this in the collector, so maybe it's a bug? I just tried to install Zope 2.6.1, but I thought that this time I would be nice and neat and actually put up an event.log (I usually just run my development Zopes to stdout). However, the Zope refused to start. No error messages anywhere, it just logged that it started the threads and then silently died. I traced this back to setting EVENT_LOG_FILE="var/event.log" Setting it to "$cwd/var/event.log" fixed the problem. Now, that's OK in itself, but an error message would have been nice. ;) Bug, or?