Comm-Central build on OS X 10.7 is busted due to changesets in mozilla-central.
This was the last m-c merge: https://hg.mozilla.org/mozilla-central/pushloghtml?startID=24075&endID=24076
So I believe that some patch in this caused the problem.
Thunderbird Trunk: https://tbpl.mozilla.org/?tree=Thunderbird-Trunk
Relevant log that caused busting: https://tbpl.mozilla.org/php/getParsedLog.php?id=18233175&tree=Thunderbird-Trunk
Ryan has already closed c-c.
As far as I can tell this is a regression from Bug 818861.
Directly assigning to Neil as he is a SeaMonkey driver, routinely works in comm-central and authored the corresponding m-c patch. Though this is in a .mm file not .cpp/.h
Thanks Callek. :-)
I pushed a simple bustage fix: