Creating a QDeclarativeEngine directly does not work

I followed "Creating a QDeclarativeEngine directly" from http://doc.trolltech.com/4.7-snapshot/qmlruntime.html but
I replaced "application.qml" with "qt/demos/declarative/calculator/calculator.qml" (qt directory is my qt git checkout).

When I run the example I get Segmentation fault.

Backtrace:

#0 0xb6c345d4 in initializeDb() () from /usr/lib/libQtGui.so.4
#1 0xb6c38d99 in QFontDatabase::load(QFontPrivate const*, int) () from /usr/lib/libQtGui.so.4
#2 0xb6c13e9c in QFontPrivate::engineForScript(int) const () from /usr/lib/libQtGui.so.4
#3 0xb6c29888 in QFontMetrics::height() const () from /usr/lib/libQtGui.so.4
#4 0xb7dc94c8 in QDeclarativeTextPrivate::updateSize() () from /usr/lib/libQtDeclarative.so.4
#5 0xb7dc9930 in QDeclarativeTextPrivate::updateLayout() () from /usr/lib/libQtDeclarative.so.4
#6 0xb7dcbefc in QDeclarativeText::componentComplete() () from /usr/lib/libQtDeclarative.so.4
#7 0xb7e12ede in QDeclarativeComponentPrivate::complete(QDeclarativeEnginePrivate*, QDeclarativeComponentPrivate::ConstructionState*) ()
from /usr/lib/libQtDeclarative.so.4
#8 0xb7e13244 in QDeclarativeComponentPrivate::completeCreate() () from /usr/lib/libQtDeclarative.so.4
#9 0xb7e11d4f in QDeclarativeComponent::create(QDeclarativeContext*) () from /usr/lib/libQtDeclarative.so.4
#10 0x08048c48 in main ()