I'm new to marble and using marble-14.12.3. I built and install the source code using cmake with VS2010 . Then I tried to run a simple test code as shown below.

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#include <QApplication>

#include <marble/MarbleWidget.h>
using namespace Marble;

int main(int argc, char** argv)
{
    QApplication app(argc,argv);

    // Create a Marble QWidget without a parent
    MarbleWidget *mapWidget = new MarbleWidget();

    // Load the OpenStreetMap map
    mapWidget->setMapThemeId(QString("F:/Libraries/Marble/marble-14.12.3/data/maps/earth/openstreetmap/openstreetmap.dgml"));

    mapWidget->show();

    return app.exec();
}


. But it shows black screen and generates an application output as below.
Map theme file does not exist: ""
Map theme file does not exist: ""
Falling back to default theme: "earth/srtm/srtm.dgml"
Map theme file does not exist: ""
Couldn't find a valid DGML map.
LEAK: 1 Page
LEAK: 1 Frame
LEAK: 3 RenderObject

Please Help!!

The paths to plugins and data is compiled into libmarblewidget-qt5.so, but can be changed at runtime. To do so, use MarbleDirs::setMarbleDataPath() and MarbleDirs::setMarblePluginPath().

In short, you have to

ship all or some plugins to a folder of your choice Call

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 MarbleDirs::setMarblePluginPath("/your/plugins/install/folder");

ship all or some data to another folder of your choice
Call

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MarbleDirs::setMarbleDataPath("/your/data/install/folder");

The output you get (and likely also the segfault) happens because the compiled in plugin path does not exist on the target system, therefore Marble's plugin manager searches in / and tries to load the files it finds there.
I've found the solution here: https://stackoverflow.com/questions/38521644/error-map-theme-file-does-not-exist-qt5-application-with-third-party-librar