Difference with QFileDialog between static and dynamic build on Xubuntu

[FLdev]

I have a class that looks like the following:

class TestSaveDialog : public QWidget
{
    Q_OBJECT
    QML_ELEMENT
public:
    Q_INVOKABLE void openFile()
    {
        QString filename =  QFileDialog::getSaveFileName(
            this,
            "Save configuration",
            "/home",
            "Conf files (*.conf)");

        if( !filename.isNull() )
        {
            qDebug() << "selected file path : " << filename.toUtf8();
        }
    }
};

I have Qt 6.5.2 built from source as both a static and dynamic library. When I build my application against the dynamic library and call openFile of my class I get a GTK3 type save dialog which is what I would like. When I build against the static library I get the more old school looking GTK2 type save dialog. Any thoughts on how to get the GTK3 type save dialog when building against the static library?

[FLdev]

For anyone else encountering this issue, what was required in the CMakeLists.txt was

qt_import_plugins(application-gui INCLUDE Qt::QGtk3ThemePlugin)

as well as making sure the following packages were installed when building the static libraries and making sure to do a completely clean build after installing them.

sudo apt-get install libgtk-3-dev libglib2.0-dev