Plasma QML API - module is not installed

[agv46 at tiscali.it]

Hi all.
I have a problem with the Plasma QML API: when in qml file I write this:
Code: Select allimport org.kde.plasma.graphicswidgets 0.1 as PlasmaWidgets
in the output I find:
Code: Select allqrc:/Qml/CategoryListView.qml:3:1: module "org.kde.plasma.graphicswidgets" is not installed
Why?

In the folder "/usr/lib/kde4/imports/org/kde/plasma/graphicswidgets/" there is 
libgraphicswidgetsbindingsplugin.so file.

In CMakeLists.txt there is: 
target_link_libraries(aaa
${QT_LIBRARIES}
${QT_QTDECLARATIVE_LIBRARY}
${KDE4_KDEUI_LIBS}
${KDE4_KPARTS_LIBS} 
${KDE4_PLASMA_LIBS}
${PACKAGEKIT_QT_LIBS})

Why does the module "org.kde.plasma.graphicswidgets" is not installed?
MpMp
I have Fedora 15

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