qt - Port from Qt5 to Qt4 went to encoding issue on the Graphical User Interface -

i coded app using qt5 (5.3.2), installed qt4 (4.8.2) in same machine (win 7). compiler mingw-4.8.2 in both cases. source code files in utf-8.

using qtcreator build both, got issue related encoding in app graphical user interface of qt4 side. exemplifying:

qt5: "configurações"

qt4: "configuraçÃes"

could please give hint?