GTK for a new project instead of QT? Really? When GTK looks and feels like absolute crap on anything that's not Linux (and some would argue Linux too)...
Who ever thought this was a good idea needs to seriously re-evaluate the situation. Such a shame.
That's rich. GTK+ doesn't pretend to be seriously cross-platform. Qt does but looks horrible on anything but KDE. It tries to mimic native UI but enters the uncanny valley and is immediately noticeable as a fake. Particularly horrid on OS X.
Don't lecture us on a technical choice you don't understand.
Who ever thought this was a good idea needs to seriously re-evaluate the situation. Such a shame.