Qt 4.8.5 won't run on Mavericks (hundreds of warnings; menus aren't displayed, ...); Qt 5.2.1 will. But SoQt won't build with Qt 5 (configure cannot find qtglobal.h).
The patches in issue 45 let me build Coin and SoXt, for program A (on Mavericks). But I need SoQt for program B.
This blocks me from building program B, which is my current priority. While I have been using Coin3D for >6 years, I don't know enough about Coin3D or SoQt internals to be of much help.