@Randomator Sir, download the Qt Sources, e.g current the sources available are qt-everywhere-opensource-src-5.5.1, After extracting cd C:\qt-everywhere-opensource-src-5.5.1\qtbase\src\plugins\sqldrivers\mysql then make sure you call qmake from Qt5.5, for this purpose you can type the complete path of the qmake. then use make and make install. I hope it will help you.