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Oh, and back to the issue; they don't need to bundle the icons with the source distribution; it would simply be a matter of setting up some macros in the configure script so that when it detects MacOS X, it uses the icons that are native on the machine, thus not requiring any copying.
Even easier than that, instead of using GTK controls/widgets functions, use the native OS-X controls, with a thin GTK emulation layer on top of them.
true; but then again, I think there are some widgets that aren't available on MacOS X because of HIG issues (a Mac/*NIX guru will be able to point them out).
I'm sure they'll find a solution, but I think the more important thing is getting GTK working, then worry about tweaking and beautifying it later on.
The problem there is that GTK offers features that either aren't available in Aqua, or else don't map directly to Aqua features. Any application that uses GTK extensively (especially one that features custom widgets) wouldn't work, and unfortunately that's the majority of the "killer" GTK apps out there.