QML "QtQuick.PrivateWidgets" plugin "widgetsplugin" not found

Question

I have developed my Qt application by using shared Qt libraries.

After transition to static Qt libraries CONFIG += static, My app crashes and I see in log

QQmlApplicationEngine failed to load component

qrc:/main.qml:907 Type MessageDialog unavailable

qrc:/QtQuick/Dialogs/WidgetMessageDialog.qml:42 module "QtQuick.PrivateWidgets" plugin "widgetsplugin" not found

Problem part of qml looks like:

import QtQuick 2.1
import QtQuick.Controls 1.1
import QtQuick.Window 2.0
import QtQuick.Dialogs 1.1

ApplicationWindow {

    ...

    MessageDialog {
        id: emailSuccessDialog

        title: qsTr("Done")
        text: qsTr("Email has been sent successfully")
    }
}

My questions are:

• What is the QtQuick.PrivateWidgets plugin?
• How to fix this issue?

Answer 1

Looks like I just forgot to perform make module-qtquickcontrols in terminal

Full build command looks:

OPENSSL_LIBS='-L/usr/lib/x86_64-linux-gnu -lssl -lcrypto' 

./configure -developer-build -static -opensource -confirm-license \
-nomake examples -nomake tests -nomake tools -openssl-linked

make
make module-qtquickcontrols