To get High Fidelity's hifi working on OSX after installing their dependencies, I still had to do the following:

cd /usr/local && sudo mkdir mkspecs && cd mkspecs && sudo ln -s /usr/local/Cellar/qt5/5.2.1/mkspecs/macx-clang
cd /usr/local && sudo ln -s Cellar/qt5/5.2.1/plugins

HTH.
Twitter @bbhart