under 'GATE_calculator_build'
create folder 'platforms'
copy qwindows.dll from c:\msys64\mingw64\share\qt5\plugins\platforms\qwindows.dll or from c:\msys64\mingw32\share\qt5\plugins\platforms\qwindows.dll depending on installation
under 'GATE_calculator_build'
copy the following files from C:\msys64\mingw64\bin\ or from C:\msys64\mingw32\bin\ depending on installation
libglib-2.0-0.dll
libicuin57.dll
libpcre16-0.dll
libwebp-7.dll
Qt5Core.dll
Qt5OpenGL.dll
Qt5Sql.dll
zlib1.dll
libgraphite2.dll
libicuuc57.dll
libpcre-1.dll
libwinpthread-1.dll
Qt5Gui.dll
Qt5Positioning.dll
Qt5Svg.dll
libbz2-1.dll
libharfbuzz-0.dll
libintl-8.dll
libpng16-16.dll
libxml2-2.dll
Qt5Multimedia.dll
Qt5PrintSupport.dll
Qt5WebKit.dll
libfreetype-6.dll
libiconv-2.dll
libjpeg-8.dll
libsqlite3-0.dll
libxslt-1.dll
Qt5MultimediaWidgets.dll
Qt5Sensors.dll
Qt5WebKitWidgets.dll
libgcc_s_seh-1.dll
libicudt57.dll
liblzma-5.dll
libstdc++-6.dll
Qt5Network.dll
Qt5SerialPort.dll
Qt5Widgets.dll