Compilation error

Compilation ended with:
/home/giel/downloads/mscore-0.9.5/mscore/scriptgen/qtbindings/gui/qtscriptshell_QWindowsStyle.cpp:342: let op: control reaches end of non-void function
[ 98%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscript_QItemSelectionModel.cpp.o
[ 98%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscript_QItemSelectionRange.cpp.o
[ 98%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscript_QDropEvent.cpp.o
[ 98%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscript_QDrag.cpp.o
[ 99%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QColorDialog.cpp.o
[ 99%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QStringListModel.cpp.o
[ 99%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QItemSelectionModel.cpp.o
[ 99%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QInputDialog.cpp.o
[ 99%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QFontDialog.cpp.o
[ 99%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QDropEvent.cpp.o
[ 99%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QDrag.cpp.o
Linking CXX shared library libqtscript_gui.so
make[3]: Map '/home/giel/downloads/mscore-0.9.5/build' wordt verlaten
[ 99%] Built target qtscript_gui
make[2]: Map '/home/giel/downloads/mscore-0.9.5/build' wordt verlaten
make[1]: *** [all] Fout 2
make[1]: Map '/home/giel/downloads/mscore-0.9.5/build' wordt verlaten
make: *** [release] Fout 2

Use KDE-4.34, qt-4.5.3, qtscriptgenerator-0.1.0-i486-1, no jack.
Any ideas where, what to look for?
Thx