export QTDIR=/opt/qt5.12-rk3568
export QT_PLUGIN_PATH=$QTDIR/plugins/
export QT_QWS_FONTDIR=$QTDIR/lib/fonts
export LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH