The error messages are incomprehensible, the directory structure is gratuitously hierarchical. The program looks pretty, but from a user interface standpoint, it's extremely poorly designed. You get a message: "3 warnings, 1 error". Can you click on the "error" and go to the source line involved? No! In fact, you can't even click on the "error" and go to the error message! You have to scroll through the log and find it, and then, it's a message like ... pbxcp <needlessly deeply nested directory name>... pbxcp: failed And that's all you get. What's wrong? Who knows. I've tried three times now to use this program, and come away grumbling each time. It's opaque and illogical. I've been programming for almost thirty years now. In the Unix world, we use a program called "make". Compared to Project Builder, vi and make are user-friendly. Heck, MPW was more friendly, altho I didn't use it much. Can we build Carbon executables with MPW? I've never been fond of IDEs. The vision was to lead people from step to step, so that the tool would not get in the way of their work, but present the right option at each juncture. The realization has always been a jumble of poorly-organized menus and dialogs, with terse and ambiguous labels and icons, apparently designed more for marketing purposes than actual programming. There's got to be a better tool for programming a Mac than this. How about CodeWarrior? Can I use make? If not, are its menus and messages at least slightly logical?