ExceptionHandler::handle(LPEXCEPTION_POINTERS) in main.cpp references stackdumper(), which is only visible if _DEBUG is not defined. As a result, there's compile time errors when compiling in debug mode.
This is on branch develop (I presume that's the active development branch; couldn't find any info about how the project uses branches) as of rev 31def0dc1a. This is applicable to MSVS 2010 (should affect all MSVS versions).
EDIT: Actually, it turns out that the code inside the #IFDEFs doesn't compile, anyway. It uses non-existent variables. It's not clear why.