There is a port for wxwidgets on qt (work in progress and still with many gaps)
So this is only proof of concept.
git clone https://github.com/wxWidgets/wxWidgets.git
cd wxWidgets
mkdir bldqt5
cd bldqt5
../configure --with-qt --enable-debug --enable-compat28 --prefix=/opt/wxqt
then with flamerobin clone git
./configure --with-wx-config=/wxgt/wx-config --enable-debug --prefix=/opt/flamerobin
make
it compiles fine :)
you will have an error and you need to add the qt libs when linking
-lQt5Gui -lQt5Core
Flamerobin starts after a few errors and after that you can see and click the tree with databases and metadata and get the properties.
What doesn't work : db query and grid , you will get a crash
ps: tested on ubuntu 14.04 with qt5
What is next ? Android ;)